In women with normal menstrual cycle, the fetal bud and fetal heart can be seen under ultrasound at 6-7 weeks of menopause, and usually the fetal heart appears at the latest around 8 weeks; in women with longer menstrual cycle, the fetal heart and fetal bud appear later. The fetal heartbeat and fetal bud are usually observed by ultrasound at 6-7 weeks of pregnancy, if it does not appear beyond 7 weeks, it should be taken seriously and reviewed after 1 week. However, some pregnant women with irregular menstrual cycle, late ovulation and late implantation of fertilized eggs may delay the appearance of fetal buds and fetal heartbeats in the uterus, so there is no need to worry too much. If the fetal heartbeat and fetal bud are still not seen in the ultrasound examination after 8 weeks of pregnancy, progesterone and HCG should be checked, and if the HCG does not double or decrease in the next day, it may be considered as fetal abortion. It is recommended that pregnant women who have no fetal heartbeat in the first examination should not be too anxious and anxious, keep a calm mind, let nature take its course, pay attention to rest and diet, do not let anxiety affect rest and thus affect the health of the fetus.