The best time to have a medical abortion is within 5 weeks to 49 days of pregnancy. After ultrasound examination, it is confirmed that the pregnancy is in the uterus, and it is necessary to check the white belt routine, blood routine, clotting time and electrocardiogram, if all the above examinations are okay, then the medical abortion can be done. If it is more than 49 days, the clinical effect of the drug is unable to kill the embryo, which will lead to the failure of medical abortion, so the time of pregnancy for medical abortion must be strictly controlled. During the period of oral abortion, especially when taking mifepristone orally, patients often experience nausea and vomiting. If the vomiting occurs within 20 minutes after the medicine, it is recommended to take additional medicine, otherwise it will lead to the possibility of failed medical abortion.