- Very late in the 4th week and with beta levels ranging between 1,000 and 2,000 - An intra-uterine gestational sac should be present. Absence of a sac is indicative of a chemical pregnancy. A sac located anywhere other than the uterus is non-viable.
- By the middle of the 5th week - A yolk sac will become visible. (A small sac within the gestational sac.) This is the earliest source of nutrients for the embryo.
- By the end of the 5th week - A fetal pole should be present. This is the first visible structure of the embryo.
- By the very end of the 5th week or very early in the 6th week and with beta levels above 6,000 - a fetal heartbeat should be seen.
I *think* I will be 5 weeks and 2 days tomorrow. But that number could be off by +/- 2 days based on the uncertainty of my chart this month. And at it's last check (a week ago) my beta level was 846 - very conservatively speaking my level should be well over 3,000 by now. So we absolutely NEED to see the gestational sac tomorrow. I KNOW how these things work. If we don't see a sac, they will tell us that our dates might be off and to come back again next week. I have yet to get good news from one of these "maybe you are earlier than you think you are" diagnoses (and I've had a couple now). So seeing an intra-uterine sac tomorrow is critical for my sanity. Technically it *could* be too early to see a gestational sac, but realistically speaking I got a positive pregnancy test 2 weeks ago - I am at least 5 weeks pregnant and there should be a sac there.
Anything more than a gestational sac at this point is just icing on the cake. I would love to see a yolk sac or even a fetal pole, but simple science says that I should not get my hopes up about either.
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