I am 7 weeks today. At 5 wks 3 days, had some light bleeding, and U/S showed gestational size perfect for the length of my pregnancy. Bleeding stopped after 1/2 a day, and a week later (at 6 wks 2 days) had some more light spotting and cramping. Went back to Dr and after another U/S, was told that the sac and yolk can be seen, but no embryo. Gestational size was only 5 wks 1 day (2 days less than the previous U/S - which was just plain confusing to me!) Dr said I would prob miscarry, and did an hCg, comparing it to the one I had done at 5 wks 3 days (a week earlier). The levels rose. My Dr said if the levels dropped, it would be a sure sign of M/C, but they didn't. She did another blood test 3 days later, to check the levels again. I don't get the results of those until this afternoon. I have to say, I've not heard anything stating that an embryo must be present if a yolk sac is present. My Dr gave me the indication that the yolk sac can be there, but no baby developing at all. My Dr is encouraging D&C, but after reading info on this site about "misdiagnosed M/C", my husband and I really want to be sure, since I'm not past 8 weeks yet. I plan on asking my Dr if my uterus is "tilted" today, since this site states it is not uncommon to miss the embryo in an U/S prior to 8 weeks if the uterus is tilted. I'm still holding out hope, and would hate to end this Pregnancy if this baby has a chance, and is just developing slowly. I wish the very best for you!