If you need to terminate a pregnancy, the most appropriate time period is between 42 and 49 days of pregnancy. The most common methods for terminating a pregnancy in the early stages of pregnancy include artificial abortion and medication abortion, each of which has its own advantages and disadvantages. When the pregnancy is less than 49 days, it is recommended to prefer medication abortion, which is less damaging to the cervix and the uterine lining. However, medication abortion may cause abortion failure or incomplete abortion, and once this happens, it is necessary to carry out a purging. If you miss the best time for medication abortion, between 50-70 days, you can have an abortion, most of the abortion can be one-time abortion clean, the main adverse effects will damage the endometrium or cervix, increase the incidence of intrauterine infection.