Based on LMP I should be 7 weeks 2 days, but scan is measuring 6 weeks 3 days. My cycles have varied from 26 to 47 days in the last 6 months, so late ovulation would make sense. I had a private abdominal scan on July 19th that showed a sac measuring 4 weeks, then went back exactly a week later and it measured 5 weeks. Then had my first dr appointment yesterday and had a transvaginal ultrasound done. The sac measured 6 weeks 3 days but showed nothing in it. The doctor seemed convinced I had a blighted Ovum. I had her check my HCG and it is 6,065, which would be normal for a late 5 week, early 6 week pregnancy. At what level HCG can you definitely see the yolk sac? I have an extremely tilted uterus also and the tech hardly scanned me. Just looked for 20 seconds and said I was too early, only to have the doctor come in and tell me shes sure I'm miscarrying. I've cried all I can at this point. I dont believe her as I feel it's too early but I dont want to get my Hope's up.