I just went in for a vaginal ultrasound, I am 5 weeks 4 days, the Dr. saw 2 sacs one with a definate baby / yolk inside and the other one just had some faint echoing. Is there still a possibility it could be twins? Gestational Sac week 4 ultrasound … 3.1.2. The gestational sac forms around five to seven weeks after the last menstrual period in natural cycles, so it is usually visible between 3 and 5 weeks gestational age using a transvaginal ultrasound. For mothers expecting identical twins, there will be one gestational sac and two yolk sacs; for non-identical twins, there are two gestational sacs and two yolk sacs, with an embryo forming in each. So I just got back from my first early ultrasound and there is definitely one baby measuring 5 weeks 5 days with a heartbeat (don't know how fast, she said it was too early to measure). While a gestational sac is sometimes seen as early as during the 4th week of gestation, it may not be seen until the end of the 5th week, when the serum hCG levels have risen to 2500 - 3500 mIU/mL. Whereas, if the twins are identical, you will see two yolk sacs with the embryo of around 1.25mm in length and a single gestational sac. My belly already looks big (for two months) which may be bloating. Number of amniotic sacs within the chorionic cavity ... but a postzygotic anaphase lag can cause the loss of the Y chromosome in one of the twins. They run in the family so I know I'm "at risk" for twins. Yet, people who have another ultrasound later in the first trimester—or even into the second trimester—have been surprised when the second ultrasound clearly reveals two (or more) developing fetuses. This ultrasound scan will help one to see the gestational sac along with the yolk sac. If your hoping for a singleton or twins, the five-week ultrasound is your first glimpse into how many babies you should begin shopping for. I had a sonogram at 5 wks and they only saw one yolk sac. But I'm just wondering if there is still a chance of twins. The baby measured 2 mm and was attached to a round circle (I think that is the yolk sac … On your 5 weeks pregnant ultrasound, you should be able to see your gestational sac and the yolk sac which is always present when you are 5 weeks pregnant. The Dr said most likely the second one will progress and we will have twins, we go back in 2 weeks but I was just wondering if this has happened to anyone else?? They calculated me to be 5 weeks and 5 days at the second scan, so that means I was 5 weeks and 2 days when they only saw the gestational sac. The gestational sac contains the amniotic fluid, and appears as the black area on your 5 week ultrasound pictures. If you are carrying fraternal twins, you will be able to see the yolk sac as well as the fetal poles in two separate sacs. Transvaginal ultrasound has a higher sensitivity and produces clearer images than a transabdominal ultrasound. They only saw a sac. The two separate gestational sacs with one yolk sac each are visible and a thick septum separates them. I'm 8 weeks now and I've already outgrown my clothes..well, they are very tight. For example, if your first ultrasound was taken prior to eight weeks of gestation it might have clearly revealed one distinct embryo. All this was done with a very sensitive transvaginal scanner. At 4 weeks and 3 days, a tiny gestational sac becomes visible within the decidua. Dichorionic diamniotic pregnancy at 5 weeks of gestation. ? Three days later they did a follow up scan and saw the gestational sac had grown and now had a yolk sac inside. In case of twins, you will also be able to see the fetal poles along with the yolk sac. 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