I had a sonogram at 5 wks and they only saw one yolk sac. My belly already looks big (for two months) which may be bloating. This yolk sac is providing nutrients to the embryo, but the embryo is too small to show up at this stage. Hang in there. I'm 8 weeks now and I've already outgrown my clothes..well, they are very tight. gestational sac and yolk sac at 5.4 weeks, but no fetal pole. The gestational sac is that black area, while the yolk sac is the small white circle you see at the sac’s upper left. 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. I went to the doctor yesterday at 5 weeks and 4 days. Dr. Andrew Silverman answered 48 … 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. Not all ends in a bad news!! They run in the family so I know I'm "at risk" for twins. what are the chances an embryo will show up? 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. (last week i had an u/s at 6 weeks, and only saw a gestational sac and yolk sac, measuring 5 weeks) I went in for another ultrasound today, at 6 weeks 6 days. 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 yolk sac is first visible at 5 weeks and it is always present by 5 weeks and 4 days. I had confirmed my pregnancy by 5 hpts and 1 blood test. Yolk sac. At this stage of your pregnancy, a yolk sac should be visible inside the gestational sac. It is normal before 6 weeks to only see a sac via u/s. Since the connecting stalk is short, the embryonic pole is found near the wall. 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. Is there still a possibility it could be twins? worried ab blighted ovum. Especially if there is some question as to the accuracy of your dates. He seemed very pessimistic and said we have a 50% chance of miscarriage. 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. By 6-7 weeks, fetal poles should be present along with the yolk sacs. He saw a gestational sac and a yolk sac but no fetal pole. Just an update! 5 Week Ultrasound Pictures. We did the ultrasound, we saw the uterus and yolk sac but no fetal pole. 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