In medicine, abortion is also defined as the phenomenon that the fetus has formed and spontaneously aborted during pregnancy 12 ~ 28 weeks. From the first trimester to the 28th week of pregnancy, the fetus may be unstable, and abortion may occur due to its own reasons or external factors. Abortion is also a kind of delivery, but the pregnancy time is relatively short, and the delivery process is basically the same as normal delivery, but the time will be slightly shorter. According to clinical medical research, the probability of pregnant women's abortion is 15% to 20%, including abortion.