Hidden twin on ultrasound

Hidden Twin??? v. vickdis. May 14, 2024 at 2:22 PM. So, I’m 9w4d right now. Last week, I had bloodwork at a new OB office, as my gyno only does initial tests and is not affiliated with a hospital for delivery. My HCG last week showed >200,000. I had a transvaginal ultrasound at 7 weeks, and everything was measuring as expected with …

Hidden twin on ultrasound. Epidemiology. Before the advent of ultrasound, little was known about the phenomenon of vanishing twin syndrome (VTS). It was disclosed in 1945 by Stoeckel that the rate of multiple gestations is greater than the rate of their birth, i.e., a twin or even multiple can be lost during multi-fetus pregnancy before the mother is even aware of the …

Dec 19, 2023 ... As your babies grow, they have less room to maneuver. In this twin ultrasound image, the babies look as though their heads are touching. Often, ...

Hidden twin? d. darci5. Posted 02-14-14. Any moms of multiples have a hidden twin at your first ultrasound? The tech was very quick with the ultrasound...but it seemed pretty clear there was only ...The Next Ultrasound. Ultrasounds —or sonograms—are commonly performed around 18 weeks of pregnancy, but some people may have an ultrasound done in the first trimester (around seven weeks). This early-pregnancy imaging test is typically done under certain circumstances. The amount of detailed imaging detectable at this …Sep 4, 2020 ... Dr. Wilshire demonstrates the ultrasound findings of a twin pregnancy at 5 and 5/7 weeks gestation. These are completely normal looking sacs ...Hidden twin?? A. AGirlMommaX4. Nov 26, 2023 at 11:41 AM. I had my first ultrasound at almost 11 weeks and my bladder was extremely full. (I had a long drive and was running late so I just held my pee) The ultrasound tech said that she was having an extremely hard time seeing the baby, let alone being able to tell if there could be another …The 12-week ultrasound is usually an external scan. (In occasional cases, an internal — known as transvaginal — scan may be necessary if the external scan can’t produce a clear image.) You ...Twin or multiple pregnancy is a term used to describe having more than one fetus in the uterus. Multiple pregnancy is usually diagnosed by fetal ultrasound, ...Hidden twin~is it possible? ... its twins or not since its the egg that splits in 2 and that is the 'womens' job. shadowing in the backround of an ultrasound could be a number of things not always ...A hidden twin on ultrasound commonly occurs in the first trimester of pregnancy. Because the embryo is smaller and it can be difficult to both see the baby and hear its heartbeat. Also, if babies are monochorionic or are both inside a single sac (chorion), the environment would force the fetuses to be so closely positioned that makes …

In uncomplicated dichorionic twin pregnancy, ultrasound imaging should be performed in the first trimester, again at around 20 weeks' gestation (second-trimester anomaly scan), and every 4 weeks thereafter (unless a complication is detected which might require more frequent scans) (Figure 2) 1. In uncomplicated monochorionic twins, an ...Chorionicity Determination (Ultrasound) Optimal timing to determine chorionicity by ultrasound is in the first or 2nd trimester. ACOG/ SMFM recommend that chorionicity should be identified as early as possible. Ultrasound <13w6d may identify chorionicity in approximately 95% of cases based on membrane thickness and insertion. …We saw a baby with a heartbeat and moving around! About 10-15 minutes in, as the technician held the picture on the ultrasound, I made a joke saying “when you hold it like that it looks like there are two babies.”. I said this because I saw two ovals. She then said “actually...there are two.”.Dec 4, 2012 · Baby B was hidden behind baby A. We found out at 20 weeks we were having boy/girl twins :-). They are now 3 1/2 months old and healthy as can be THANK GOD. a. attorneymom. Dec 4, 2012 at 11:10 AM. @mcgeelisha, My 6 week ultrasound showed one baby. We found out about the second at the 18 week gender scan. The triplet and higher-order multiple birth rate was 93.0 per 100,000 births for 2018, an 8% decline from 2017 (101.6) and a 52% decline from the 1998 peak (193.5) 4. The long-term changes in the incidence of multifetal gestations has been attributed to two main factors: 1) a shift toward an older maternal age at conception, when multifetal ...Baby B was hidden behind baby A. We found out at 20 weeks we were having boy/girl twins :-). They are now 3 1/2 months old and healthy as can be THANK GOD. a. attorneymom. Dec 4, 2012 at 11:10 AM. @mcgeelisha, My 6 week ultrasound showed one baby. We found out about the second at the 18 week gender scan.Its hard to tell with the 4D ultrasound tbh usually you’d be able to see two yolk sacs then. 1. Like. Cooki3CatKayla. Jul 13, 2023 at 7:50 AM. @mdc1999, not necessarily, they don't always have a separate sac. they can share the same sac as well. if they are identical twins it's a chance they can not only share the same sac but even share the ...

An ultrasound scan detects a twin pregnancy, with accurate scan pictures from around 6 to 10 weeks. By 6 to 10 weeks, the doctor can schedule an early ultrasound scan to determine if you are carrying a twin. ... as cases of hidden twins are more likely to occur if an ultrasound scan is too early. Final Words. We can say that twin pregnancy ...OverButton. I found out I'm having Twins - Apparently had a hidden twin?! This is my 3rd pregnancy so this is not my first rodeo. I am 20 weeks as of last Wednesday. I went for an ultrasound/checkup at ~12 weeks and then they told me due to COVID and me being high risk they didn't want to have me come in for another ultrasound until 20 weeks.Iona from firstScan shows the benefits of having an internal (vaginal) scan to show twins at as little as 6 weeks pregnant.Jan 24, 2022 · How Is a Twin Pregnancy Confirmed? Ultrasound. While there are many signs and symptoms of a twin pregnancy, there’s only one way to know for sure—an ultrasound. Pregnant with twins ultrasound image. Some women choose to have one done early, while other women will choose to avoid ultrasounds until the 20-week scan. Still, other women, albeit ... What you can expect to see. Have a nice day Photo/Shutterstock. A 7-week ultrasound showing crown rump length of baby, which helps figure out the age of the fetus. Surrounding the fetus is the ...A full bladder is needed during an ultrasound because it helps to provide the best image, as stated by the National Institutes of Health. When the bladder is full, the uterus is mo...

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Realizing that celebrity and fame does not mitigate a family’s struggle with mental illness. Twin Peak’s Mädchen Amick shares her family's story. We include products we think are u...Epidemiology. Before the advent of ultrasound, little was known about the phenomenon of vanishing twin syndrome (VTS). It was disclosed in 1945 by Stoeckel that the rate of multiple gestations is greater than the rate of their birth, i.e., a twin or even multiple can be lost during multi-fetus pregnancy before the mother is even aware of the …I had a huge surprise at my 12 week scan. How did they miss the other baby?!I used cheap ovulation and pregnancy tests! linked below..Pregnancy Tests https:/...An ultrasound scan detects a twin pregnancy, with accurate scan pictures from around 6 to 10 weeks. By 6 to 10 weeks, the doctor can schedule an early ultrasound scan to determine if you are carrying a twin. ... as cases of hidden twins are more likely to occur if an ultrasound scan is too early. Final Words. We can say that twin pregnancy ...Jun 25, 2019 · Welcome to BLUE times TWO!!! A channel where I talk all about my identical twin pregnancy.Here I talk about finding out I'm pregnant, then finding out it wa... If two fetuses are seen by ultrasound, the woman is expecting twins. Although rare, ultrasound pictures can at times be misleading or misinterpreted, especially if they are taken very early in the pregnancy.

We saw a baby with a heartbeat and moving around! About 10-15 minutes in, as the technician held the picture on the ultrasound, I made a joke saying “when you hold it like that it looks like there are two babies.”. I said this because I saw two ovals. She then said “actually...there are two.”.In uncomplicated monochorionic twins, an ultrasound scan should be performed in the first trimester. There should then be scans every 2 weeks from 16 weeks onwards, as timely detection of TTTS and TAPS has been shown to improve perinatal outcome (Figure 3) 19, 20 (EVIDENCE LEVEL: 4).I had a vaginal ultrasound at 10wks that showed only one baby. Had a suprise ultrasound at 18wks and there was another baby!! Baby A was hiding her brother (baby b) LOL Both babies have been fine so far- last ultrasound was at 20wks, last heart check was at 22wks. Im 25wks now and my next appt is in 10days. My babies are …In this article, we will explore the possibilities and limitations of a hidden twin ultrasound at 6 weeks. First and foremost, it is crucial to understand that the early stages of pregnancy can be a bit tricky when it comes to ultrasound scans.What usually happens when a twin is hidden, according to Verywell Family, is that early ultrasounds might visualize only one embryo. A later ultrasound might reveal there actually is another...Most twin or multiple pregnancies are discovered during an ultrasound. During this exam, sound waves are used to create images of your uterus and baby — or babies. Sometimes a seemingly normal twin pregnancy is later found to have only one baby. This is known as vanishing twin syndrome. Such an episode can be heartbreaking, frustrating and ...Six weeks is still so early my ultrasound at six weeks missed one. Like. m. miapapillon. I think it’s pretty common. First ultrasound at 7w and saw one baby one heartbeat, just had another one at 12w and tech clearly saw two babies/two heartbeats. Total shocker! Like.Twin Ultrasound at 12 Weeks. A baby at 12 weeks is basically fully developed, and now just has to grow. That means if you have an ultrasound, they’re going to look recognisably like a person. You’d also be surprised with how much your babies are going to be moving around at 12 weeks. Not only are they going to be flexing limbs and opening ...Advertisement ...If you’re in the market for a new bed, you might want to consider investing in a twin adjustable bed base. These innovative beds have been gaining popularity in recent years and fo...

Hidden twin pregnancies often come with extra weight gain at a faster rate. This is because your body produces more pregnancy hormones, and your uterus grows to accommodate two babies. An ultrasound scan during the second trimester can help identify the increased weight gain associated with twin pregnancies.

“A hidden twin on ultrasound is most likely to occur with early ultrasounds during the first trimester,” says Abdur-Rahman, “because the smaller the embryo, the more difficult it is to...This week, and the coming weeks, will see things start to get a little, um, achy. As you and your babies grow in size, expect it to start taking a toll on your body. But you’ve come this far. We’re almost halfway already! Backaches: As your babies get heavier and put more strain on your body and your back, expect this symptom to only get worse.Someone on my birth board just learned of a hidden twin at about 30 weeks after having had earlier ultrasounds--I can't remember how many. But like pp said, it has to be exceedingly rare. sAt each subsequent ultrasound examination the sonographer documented which twin (left or right, top or bottom) was the presenting twin. In all discordant-sex twins, the sex and presenting order of the twins on the final scan prior to delivery was documented and compared with the sex and birth order at vaginal delivery or Cesarean section. ResultsMar 1, 2016 · Possible twin pregnancy (two sacs) but only one baby on scan. Early pregnancy signs and symptoms. Missed period, negative pregnancy test, white discharge, cramping. Early pregnancy signs and symptoms. Ultrasound scans at 8 weeks pics. Early pregnancy signs and symptoms. In the field of medical diagnostics, ultrasound scans play a crucial role in providing valuable insights into various health conditions. This non-invasive imaging technique utilize...May 31, 2002 ... With the advent of ultrasound, early loss of a member of a multiple gestation has been identified4,5 and has been described as "the vanishing ...Hidden identical twin? a. autogenerated-a9bd8be3. May 15, 2024 at 12:07 PM. Hallo everyone. Can somebody explain to me what is under the seen baby? So the baby is up on the photo, you can see the head and the tummy but i dont understand what is down in the sac? You can not see it on tho photo but in the Ultrasound it was much …Twins Ultrasound - 9 Weeks. by Haydie. If you cannot see above text Baby A (top) measured 8 weeks 5 days, heartbeat 178. And B (middle) measured 9 weeks 4 days, heartbeat 162. I started having ultrasounds in my 6th week and B has always measured 1-4 days behind A. Bottom pic shows both A&B. We do not know if they are identical or …

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If two fetuses are seen by ultrasound, the woman is expecting twins. Although rare, ultrasound pictures can at times be misleading or misinterpreted, especially if they are taken very early in the pregnancy.Identical twins happen when a single embryo from one egg and one sperm divide in two. The twins may share one or have separate placentas. Identical twins are always of the same sex. Conjoined twins are extremely rare and occur when an identical twin embryo does not fully divide. The babies’ bodies are fused and may share vital …Aug 22, 2018 · Abstract. Ultrasound has revolutionised the management of multiple pregnancies and their complications. Increasing frequency of twin pregnancies mandates familiarity of all clinicians with the relevant pathologies and evidence-based surveillance and management protocols for their care. In this review, we summarise the latest evidence relating ... Determining if you have a hidden twin can be a challenging task, as it requires careful examination during ultrasound scans. However, there are certain signs and techniques that can help detect the presence of a hidden twin: 1. Early ultrasound: During the early stages of pregnancy, an ultrasound may reveal a hidden twin.In this article, we will explore the possibilities and limitations of a hidden twin ultrasound at 6 weeks. First and foremost, it is crucial to understand that the early stages of pregnancy can be a bit tricky when it comes to ultrasound scans. At 6 weeks, it may be too soon to see the baby/babies on the scan.Hidden twin stories! k. Koranju. Posted 04-23-18. I posted some time back about my fundal height being crazy high for the number of weeks I am. It has remained high. I'm 18 weeks now and my uterus ...I’m an identical twin and my twin sister was the hidden twin. My mom swears she had to role to the side to see my sister in the ultrasound the first couple months because I always kept her in the back.A hidden twin refers to a situation where one fetus is concealed behind or overshadowed by a larger or more prominent sibling. This occurrence is known as "vanishing twin syndrome" and is estimated to happen in about 1-2% of all pregnancies. Several factors contribute to the occurrence of a hidden twin.h. hollyg83. Mar 9, 2019 at 9:00 PM. Don’t want to scare anyone but, I had a transvaginal ultrasound at 8 weeks and they said one baby, then went in for my 11 week just a couple days ago and behold there are two babies. I’m still in some shock, especially after being told there was just one at first. ….

Someone on my birth board just learned of a hidden twin at about 30 weeks after having had earlier ultrasounds--I can't remember how many. But like pp said, it has to be exceedingly rare. sThe earliest ultrasound for twins can be performed around 6 to 7 weeks of pregnancy using a transvaginal ultrasound. This allows for the detection of multiple gestational sacs or embryos, indicating the presence of twins. Conclusion. A 7-week ultrasound is an effective method for confirming the presence of twins or other multiples in a pregnancy.May 15, 2011 at 8:13 AM. Ours were natural, but I told them specifically on the first two ultrasounds...is it twins?! My great grandmother had four sets of twins. Then I HAD to know for sure on the second ultrasound because I had just totalled my car and needed a new one...or an SUV or minivan if it was two.Twins Ultrasound - 9 Weeks. by Haydie. If you cannot see above text Baby A (top) measured 8 weeks 5 days, heartbeat 178. And B (middle) measured 9 weeks 4 days, heartbeat 162. I started having ultrasounds in my 6th week and B has always measured 1-4 days behind A. Bottom pic shows both A&B. We do not know if they are identical or …With twins you will (probably) be growing very fast. It did not happen to me, but it may have had I not explicitly asked them to look for a second baby bc my betas were high. The ultrasound tech def seems to be more focused on confirming any pregnancy vs the details of it once confirmed.The nurse suspected twins at the 6 weeks ultrasound appointment but the doctor said it wasn’t. They still weren’t sure at the 8 weeks ultrasound. ... Doctor said it’s common for the other twin to be hidden. Excited though! Lol. Like. Report as Inappropriate. m. momof33126. @icedcoffeehouse0, this is so reassuring! I have another ...Ultrasound scans are usually done through the abdomen, but early in pregnancy, they’ll be done through the vagina. A basic ultrasound takes about 15 to 20 minutes. A more detailed twin ultrasound scan can take anywhere from 30 to 90 minutes or more. All twins can be detected after week 6+0.Dec 1, 2020 at 7:55 PM. My midwife missed my twins at 9.5 weeks... didn’t find out until 12 weeks. But I think she was just really really new and inexperienced. I think it is uncommon for them to be missed at 8 weeks. Congrats on the pregnancy either way!! Maybe drink extra water and eat extra protein just in case!If you’re in the market for a new bed or mattress, you may find yourself overwhelmed by the wide range of options available. From twin to king, there are various sizes to choose fr...An ultrasound scan detects a twin pregnancy, with accurate scan pictures from around 6 to 10 weeks. By 6 to 10 weeks, the doctor can schedule an early ultrasound scan to determine if you are carrying a twin. ... as cases of hidden twins are more likely to occur if an ultrasound scan is too early. Final Words. We can say that twin pregnancy ... Hidden twin on ultrasound, Get out! r/parentsofmultiples. When my twin and I were born in 1968 in the UK scans werent the norm, Mum found out she was having twins 6 weeks before we were born!!! I was around 10 weeks when they “found” the second baby. I conceived via IVF so I knew I was pregnant really early on. Had an ultrasound too., 8 weeks pregnant with twins. At 8 weeks pregnant with twins, you've likely seen (or will soon see) your babies on an ultrasound. Pregnancy symptoms at this time include morning sickness, bloating, food cravings or distaste, fatigue, breast changes, frequent urination, and increased vaginal discharge. Your twin babies will soon be …, Celebrity siblings often make epic pairings — but what about celebrity twins? While the power of twin relationships is undoubtedly strong, things tend to get complicated when celeb..., 8 weeks pregnant with twins. At 8 weeks pregnant with twins, you've likely seen (or will soon see) your babies on an ultrasound. Pregnancy symptoms at this time include morning sickness, bloating, food cravings or distaste, fatigue, breast changes, frequent urination, and increased vaginal discharge. Your twin babies will soon be considered ..., May 12, 2022 · Vanishing twin syndrome is a type of miscarriage that can occur during multiple pregnancies (births involving twins or triplets). It occurs when an embryo detected during an ultrasound can’t be found on a future ultrasound. The embryo stops developing, and its tissue gets absorbed by the mother, or gestational parent, and the surviving embryo ... , May 12, 2022 · Vanishing twin syndrome is a type of miscarriage that can occur during multiple pregnancies (births involving twins or triplets). It occurs when an embryo detected during an ultrasound can’t be found on a future ultrasound. The embryo stops developing, and its tissue gets absorbed by the mother, or gestational parent, and the surviving embryo ... , While ultrasounds may be immediately associated with pregnancy, there are other times when a physician might order this diagnostic test. Whether your health insurance will cover an..., Vanishing twin syndrome happens when a person is pregnant with twins or multiple fetuses but miscarries one of them. It's referred to as “vanishing” twin syndrome because the twin or multiple essentially disappears in the uterus. The tissue from the vanishing twin is reabsorbed by the remaining fetus or fetuses, the pregnant person’s …, Jun 21, 2021 · A hidden twin usually refers to a twin found in a later U/S in the same gestational sac which would be identical twins-one egg that split, usually one placenta 70% of the time. Clomid does not increase your chances of producing identical twins or the possibility of an egg splitting where the term “hidden twin” comes from. , Chorionicity Determination (Ultrasound) Optimal timing to determine chorionicity by ultrasound is in the first or 2nd trimester. ACOG/ SMFM recommend that chorionicity should be identified as early as possible. Ultrasound <13w6d may identify chorionicity in approximately 95% of cases based on membrane thickness and insertion. Dichorionic., Such “hidden twins” are more likely to occur when the twins are monochorionic (have one chorion, the outer fetal membrane) and positioned closely in their single chorionic sac. However, after 20 weeks of pregnancy, the fetuses have grown enough that a second fetus would be clearly visible on ultrasound, and it would be very unlikely that ... , Aug 2, 2013 at 7:38 PM. This is probably going to be long, so bear with me-. At 9 weeks, I had an ultrasound (due to a small amount of bleeding the previous week.) The ultrasound showed 2 gestational sacks. One was larger than the other and a tiny little peanut of a baby could be seen inside. The other was smaller and neither the tech, nor I ..., Apr 12, 2021 ... Ultrasonography is used to confirm the diagnosis of early twin pregnancy. Follow-up ultrasonography reveals the pregnancy loss (vanishing twin)., Little do they know, this routine procedure may hold a surprise that will leave them in awe – the discovery of hidden twins. An ultrasound at 6 weeks can reveal the presence of twins, even if they were previously unknown. This early stage of pregnancy is when the embryo is rapidly developing, and the ultrasound can capture the miraculous ..., The usual prenatal ultrasounds include a dating scan somewhere between 10 and 14 weeks, and an anatomy scan between 18 and 22 weeks. These ultrasounds confirm your pregnancy, monitor the fetal heartbeat, determine the gestational age and sex, and observe general growth and development. You may also have an optional nuchal …, Sep 6, 2021 ... Vanishing Twin || Ultrasound || Case 142 Clinical Features: - A young married female patient came with amenorrhoea for 3+ months., I’m sure this is commonly asked, lol, but wondering about the possibility of a twin missed at 8 week abdominal ultrasound. Reasons I think it’s possible I’m 11w but my uterus is halfway to my belly button feeling more movement than normal (YES it’s movement it’s my 3rd pregnancy to get this far) , Someone on my birth board just learned of a hidden twin at about 30 weeks after having had earlier ultrasounds--I can't remember how many. But like pp said, it has to be exceedingly rare. s, Ask your question. can a vanishing twin actually be hidden? i am 35 have and have 10 living children, 4 miscarriages . 6 week sonogram clearly showed 1 baby. 8 week sonogram showed 1 baby with heartbeat and another sac partially hidden behind baby. it definitely wasn't eas: Yes: It sounds like a retained dead twin that was small and not so muc. , Pregnant with twins ultrasound image. Some women choose to have one done early, while other women will choose to avoid ultrasounds until the 20-week scan. Still, other women, albeit rare, have no symptoms of twins and only find out at the birth! ... it’s possible for there to be a hidden twin (one twin is hiding behind the other during the ..., I also have two girls - 3 and 2 years old, so this is not my first time at the. "rodeo." I found out I was pregnant at 3 wks. Before the stick even. dried I knew this pregnancy was different - maybe twins. Since then, I have. gained 12 lbs. (I am 5'9", now 145 lbs, and only gained 23 lbs with each. of my previous pregnancies)., When it comes to choosing the right bed for your bedroom, there are several factors to consider. One of the most important decisions you’ll have to make is whether to go with a sin..., DarthMutter8. •. I am 21 weeks pregnant and just came back from my anatomy scan. We found out we are having twin girls! I didn't have an earlier ultrasound but twins were not on our radar. There are a few twins on my husbands distance side of the family but none at all on mine. So shocking! Congratulations to you guys! , Yes, first US at 6 weeks just one but then we had another at 7 to confirm viability and they found 2. Like. u. user12345678910. May 12, 2022 at 6:59 PM. So by 10 weeks they would definitely have been seen. Early US like 5/6 weeks can sometimes be missed, but my twins were clear as day at 8 weeks and impossible to miss., Your Twin Babies at 6 Weeks Pregnant. Your babies are twice as big as they were last week, and by week 7 they’ll be twice as big again! Right now, the developing embryos are about a quarter of an inch long, or the size of a sweet pea. This is the week where the head starts to develop, with dark spots where your babies beautiful eyes will form ..., If you’re considering a career as an ultrasound technician, also known as a diagnostic medical sonographer, it’s important to find the right ultrasound tech school that suits your ..., In twin pregnancy, screening for trisomy 21 can be performed in the first trimester using the combined test, which includes maternal age, NT measurement and serum β-hCG and PAPP-A levels. An alternative is the combina-tion of maternal age and the NT recorded between 11. 0 and 13 6 weeks of gestation1. In case of., Most hidden twins at the time of delivery are seen in patients who had little or no prenatal care, but there have been documented cases of women who had prenatal care and still delivered a hidden twin.” ... Is it possible for ultrasound to misread twins? Misread Ultrasound Involving Twins Results in One Death and One Injured Child. $1,800,000 ..., Twins on both sides of the family doesn't really matter, twins is only based on your side of the family, but having that genetic factor does increase your chances by a bit. We've defintly had people here who found out they were having twins in later ultrasounds, but generally they catch it during the first ultrasound., Recently I gave birth to fraternal twin babies -- one I carried as a stillborn for a number of weeks after her passing due to a condition known as Turner... Edit Your Post Publishe..., A hidden twin on ultrasound commonly occurs in the first trimester of pregnancy. Because the embryo is smaller and it can be difficult to both see the baby and hear its heartbeat. Also, if babies are monochorionic or are both inside a single sac (chorion), the environment would force the fetuses to be so closely positioned that …, Ask your question. can a vanishing twin actually be hidden? i am 35 have and have 10 living children, 4 miscarriages . 6 week sonogram clearly showed 1 baby. 8 week sonogram showed 1 baby with heartbeat and another sac partially hidden behind baby. it definitely wasn't eas: Yes: It sounds like a retained dead twin that was small and not so muc., Ultrasound has a critical role in the management of twin pregnancies (and multiple pregnancies in general) in all three trimesters. In twin pregnancies, even if they present late for prenatal care, the assessment of chorionicity and amnionicity can and should be attempted. Usually, this attempt will be successful.