Since we are under the care of an RE we will be getting weekly/biweekly ultrasounds until we are released to our OB at 8-12 weeks. Yesterday I was 5w5d and we saw this:
There are definitely two sacs, and one of them for sure has a yolk sac (the one of the left.) The other is either a) a twin that has already passed, b) a fluid-filled sac, or c) a twin that is not big enough yet to see on ultrasound. We will go back on Thursday and again on Monday for repeat ultrasounds- hopefully we will know by Monday what is in the second sac.
My bloodwork does not indicate twins so we are thinking of this as just a singleton pregnancy, but will be thrilled with two.