Normally, if you usually have regular periods, you can see the fetal heart and germ on day 42 of pregnancy. However, it can only be detected by ultrasound. For women with thick abdominal fat, it may not be easy to see by transabdominal ultrasound, so you can use vaginal ultrasound to detect it at this time instead. If the fetal heartbeat and fetal bud are not visible at that time, you can repeat the test in a few days. If the fetal heartbeat and fetal bud are still not visible after the recheck, you should be alert to the possibility of embryonic arrest. In this case, we need to take blood and check the human chorionic gonadotropin and progesterone values to evaluate whether the embryo has stopped developing. Normally, fetal heartbeat can be detected by ultrasound at about 6 weeks of pregnancy, and after 12 weeks of pregnancy, the fetal heartbeat can be heard with a fetal heart monitor in the abdomen.