If menstruation is usually regular and the cycle is 30 days, then primitive cardiac tube pulsation can be visualized by ultrasound at about 7 weeks of menopause. It is recommended that if you are pregnant, it is best to have an ultrasound at about 50 days after menopause. If after 7 weeks of menopause, the primary heartbeat is still not visible on ultrasound, it is recommended that the examination be repeated after 5 days. If it is still not visible, then it is possible that the embryo has stopped developing. It is recommended to combine the time of the last menstruation, whether the menstruation is regular or not, and combine the blood HCG and progesterone values to analyze comprehensively, and if it is the case that the embryo has stopped developing, it is recommended that the clinic give treatment as soon as possible, so as not to cause coagulation disorders in the clinic.