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At 6 weeks and beyond we expect a fetal pole or yolk sac to be visualized on USG. By 7 weeks, we must see the cardiac activity. If there is no embryo and no heart beat even beyond 7 weeks, we call it a blighted ovum (BO) with only a sac and no contents inside. It can happen due to a chromosomally abnormal gestation and hence does not survive. It regresses on its own. To date your pregnancy, we calculate period of gestation by LMP (last menstrual period) and then confirm it with an earliest scan within 3 months of pregnancy. In case there is no difference between the two dates or a difference is less than a week, we consider the LMP to calculate the expected date of delivery and period of gestation. Do not worry, you can conceive again. But no hope with this pregnancy. Start Folic Acid 5 mg daily for 3 months before next conception. This will help in a healthy embryo, reduce chance of miscarriage and prevent neural defects in the fetus.