I had my 1 U/S at 6 weeks. At that time there was 1 sac with a baby and heart beat, 1 empty sac, and a clot. I was told to come back in two weeks. My 2 U/S only showed 1 empy sac and a clot. I was told that I would miscarry. What is the chance that the baby is hidden behind either the empty sac or the clot. It has been 2 weeks and no signs of miscarriage.