If the pregnant woman has a regular menstrual cycle of 28-30 days, it is generally more appropriate to take abortion pills for 35-49 days of menopause. If the patient’s menstrual cycle is irregular, or if the embryonic development of this pregnancy is delayed, or even if embryonic abortion occurs, even if the menopause is longer than 49 days, but as long as the ultrasound indicates that the size of the gestational sac is <2cm, and the patient has no relative contraindications to abortion by medication, abortion by medication can be performed. Before a pregnant woman undergoes a medication abortion, it is important to check the presence and size of the gestational sac by ultrasound. If the gestational sac is present and is within 2.5 cm, a medication abortion can be performed. If there is no gestational sac in the uterus and there is ectopic pregnancy, abortion should not be performed. If the patient's physical examination is normal, there are no contraindications to medical abortion, and the presence of a gestational sac in the uterus is confirmed and the size of the gestational sac meets the requirements, abortifacient medication can be used to cause degeneration and necrosis of the uterine meconium, softening of the cervix and contraction of the uterus, and then induce the embryo to be expelled. Pain in the lower abdomen usually occurs about 2 hours after taking the medicine, and the pregnancy sac will be expelled after 6 hours, and the doctor will pay attention to observe whether there is any expulsion of the pregnancy sac. Both medical and surgical abortions are harmful to women, so it is recommended that women who do not plan to prepare for pregnancy should take good contraceptive measures before having sex to avoid unwanted pregnancies.