At this stage of your pregnancy, a yolk sac should be visible inside the gestational sac. Baby had a hb of 130, which was definitely an unforgettable sound! worried ab blighted ovum. But I'm just wondering if there is still a chance of twins. what are the chances an embryo will show up? I went in for an ultrasound at 7+ weeks past my last period, it turned out that I was measuring at only 5 weeks (or just under)... only a gestational sac... no yolk sac, fetal pole or heartbeat was detected But I prayed before and after my ultrasound and God gave me peace. The gestational sac is that black area, while the yolk sac is the small white circle you see at the sac’s upper left. My belly already looks big (for two months) which may be bloating. Dr. Andrew Silverman answered 48 … It is normal before 6 weeks to only see a sac via u/s. I had confirmed my pregnancy by 5 hpts and 1 blood test. I went to the doctor yesterday at 5 weeks and 4 days. In size, the gestational sac at five months is about 6 to 12 mm and while the embryo is present, you cannot see it as it is the size of a rice grain. The yolk sac is the source of nutrients for the fetus. Since the connecting stalk is short, the embryonic pole is found near the wall. Especially if there is some question as to the accuracy of your dates. Hang in there. This yolk sac is providing nutrients to the embryo, but the embryo is too small to show up at this stage. Stage Four: Approximately six weeks after a pregnant woman’s last period, we can see a small fetal pole, one of the first stages of growth for an embryo, which develops alongside the yolk sac. Is there still a possibility it could be twins? The yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days. Just an update! By 6-7 weeks, fetal poles should be present along with the yolk sacs. I had a sonogram at 5 wks and they only saw one yolk sac. In this transvaginal five week ultrasound image, you can see the gestational sac as the black area on the screen, together with the yolk sac, the small white disc on the left-hand side of the gestational sac. 5 Week Ultrasound Pictures. We did the ultrasound, we saw the uterus and yolk sac but no fetal pole. At about five and a half weeks after a pregnant woman’s last period the ultrasound typically shows a gestational sac and within it we can see a 3-5 mm bubble-like structure, which is the yolk sac. They run in the family so I know I'm "at risk" for twins. Not all ends in a bad news!! gestational sac and yolk sac at 5.4 weeks, but no fetal pole. I'm 8 weeks now and I've already outgrown my clothes..well, they are very tight. He seemed very pessimistic and said we have a 50% chance of miscarriage. I have read online that the fetal pole does not show until 6 weeks or more so I'm confused why he was so pessimistic. I'm 7 weeks and 6 days pregnant (according to an app) based on my lmp. 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