If a woman with normal menstruation goes for an ultrasound on the 45th day after menopause, the gestational sac is usually very obvious and the buds can be seen. If you still can’t see the gestational sac after 45 days of menopause, you need to consider two scenarios: the first one is to consider irregular menstruation, late conception, some women have irregular menstruation, it may take about 40 days to come once, in this case, although the pregnancy is detected, but the time of conception is on the later side, so the time to see the gestational sac inside the uterine cavity will be a little later. The second, need to consider ectopic pregnancy or biochemical pregnancy, ectopic pregnancy is mainly caused by some inflammation of gynecology, the most common is tubalitis. If you can’t see the gestational sac on the ultrasound, and at the same time there is vaginal bleeding and abdominal pain, you have to be vigilant about ectopic pregnancy, and the probability of ectopic pregnancy is higher in this case.