The fetal heartbeat usually appears around 6-7 weeks of gestation, and at the latest around 8-9 weeks of gestation. The time of appearance of fetal heart needs to be decided according to the time of conception and the development of the gestational sac. For women with regular menstrual cycles, the primitive heartbeat will appear around 42 days of gestation, while women with longer menstrual cycles can extend the observation time appropriately, but not longer than 60 days of gestation. If no fetal heartbeat is found after 60 days of gestation, the development of the gestational sac is slow, irregular in shape and low in position, then embryonic dysplasia may be suspected. It is recommended that women should relax after pregnancy, pay attention to rest, avoid spicy and cold food, avoid heavy physical labor, and prohibit sexual intercourse during the first and second trimesters of pregnancy. If the embryo is found to be underdeveloped, it is necessary to go to the obstetrics and gynecology department of the hospital in time to have a medical or surgical abortion to terminate the pregnancy.