For a medication abortion in the third month of pregnancy, the gestational sac is usually expelled in about 3-5 days, counting from the first day of taking the medication. The time to expel the gestational sac may also vary as each person’s constitution and pregnancy condition are not exactly the same. Mifepristone and misoprostol should be taken under the guidance of a doctor. 1-2 days of mifepristone application will cause the metaplasia of the uterus to degenerate and necrosis and soften the cervix, and on the third day mifepristone tablets combined with misoprostol will excite and contract the uterus to induce the expulsion of the embryo. Contractions usually occur about half an hour after taking the medication, and the pregnancy sac can be expelled from the uterine cavity a few hours later. However, it should be noted that medication abortion may lead to incomplete abortion or abortion failure. Therefore, ultrasound should be reviewed 2 weeks after the expulsion of the gestational sac, and if there is obvious residual in the uterine cavity, it usually needs to be treated with uterine evacuation to avoid causing uterine infection. In addition, at 3 months, the fetus is basically formed and larger, and medical abortion will increase the risk of inflammation and hemorrhage. It may also cause gynecological disorders such as irregular menstruation, secondary infertility, habitual abortion, uterine cavity infection or endometrial adhesions. Therefore, it is recommended that pregnant women in their third month of pregnancy should be induced by inpatient induction of labor, with oral medication or induction of labor injection under the guidance of a doctor to induce uterine contractions to terminate the pregnancy. After the induction of labor, ultrasound examination is needed to observe the shape of the uterine cavity, the presence of residual tissue, the accumulation of blood, and the amount of bleeding. After the operation, pay attention to rest, prohibit sexual intercourse for 1 month, and do a good job of contraception to avoid frequent and premature pregnancies, which may cause habitual abortion.