Sorry to hear about the bizarre waiting situation you're in
Its so tiring to hold onto the hope when all you need is some concrete answers. I had a m/c this spring - at 10wks I started to bleed and by the time I got into the U/S and heard back from my midwife, it was 4 days. Ugh. My u/s showed a blighted ovum - fertilized egg but no growth
I agree with everyone else that it seems weird that they saw a measurable baby and then nothing!