Abortion is possible to terminate an intrauterine pregnancy between 40 and 90 days of pregnancy, and the best time period for abortion is between 40 and 60 days of pregnancy. If the gestational sac is smaller than 40 days, it is easy to have a missed aspiration and cause a failed abortion with the continued development of the gestational sac. If the pregnancy is more than 60 days old, the gestational sac will be larger and may develop to the point of having embryonic tissue, thus increasing the risk of abortion and vaginal bleeding, such as the tendency to have heavy vaginal bleeding, uterine infection, increased uterine residue or cervical laceration. In addition, the chances of abortion syndrome are greatly increased. The abortion procedure is an artificial termination of pregnancy, which has a greater impact on the body and relatively more endocrine disruption. After the abortion, it is important to observe the symptoms of vaginal bleeding and abdominal pain. If the vaginal bleeding is heavy or the abdominal pain is severe, you need to know the details as soon as possible to rule out the presence of uterine residues.