There are two types of cases: the first one is normal pregnancy and normal ovulation, the development of the embryonic sac can be seen under the ultrasound at 35 days, and still no fetal heart at more than 50 days of menopause, then you can continue to observe for about 1 week, if there is no fetal heart and fetal bud development at 60 days of menopause, it means that the embryo is aborted and needs to be aborted. In the second case, the pregnancy is not detected by blood test or urine test at more than 30 days of pregnancy, and then the pregnancy is not detected until more than 40 days, this situation indicates delayed ovulation. The fetal heartbeat and fetal bud appear late, so once there is no fetal heartbeat in delayed ovulation, you can wait for another 10 days or so before performing a recheck to observe the appearance of a fetal heartbeat.