We had out first fetal US today and they saw 2 sacs!!
1 sac is smaller than the other so they said either the smaller one implanted later or it's not viable and will disappear.
I am 5 weeks tomorrow. We go back Wednesday for another US and I was told at that time we should see the yolk sac, or sacs and we should know then, for sure, if there is one or 2.
I'm very excited for you! I'll be excited to see if you've got one or two. I don't recall, do you have a preference? I know of course just a healthy baby but there are some who wish for twins. I highly suspect if I was married and a little younger I'd want them. Good Luck!