We had the nicest tech I've met yet doing the ultrasound. She asked about my numbers, and I told her that they were a bit high for a singleton but a bit low for twins. "Probably only one in there," was what I said, while psychohist pointed out that it was her job to look and tell us how many. As it turns out there were two sacs in there, though one is much smaller than the other. My initial reaction was that the smaller one was probably not going to make it, but when we went in to talk to our doctor about the ultrasound she though that since both sacs had yolk sacs, it was quite possible that both of them would make it. So, I might be having twins. We'll have to see if they are both still there in two weeks when I go back for a second ultrasound.
It was too early to see heartbeats at this point. That's one of the reasons to have a second ultrasound in two weeks. We'll check then to see if they are both still there and if they are viable. Grace says that the difference in size could just be that one of them impanted a couple of days later than the other. She was pretty upbeat about it given that they both have yolk sacs, so we'll see.