There are many causes of miscarriage, related to embryonic factors, maternal factors, and environmental factors. Abnormal embryo, primary maternal diseases, or exposure to radiation, chemical substances, or bad drugs, or intercourse, strenuous activities, or trauma in early pregnancy may cause miscarriage. As the embryo is unstable in early pregnancy, it is recommended to pay attention to rest, avoid strenuous exercise and trauma, avoid intercourse, eat more vegetables and fruits, and take appropriate folic acid and vitamin supplements. Regular maternity checkups, complete NT, Down screening, 4D ultrasound, glucose tolerance and other tests. In case of unplanned pregnancy, it is recommended not to use unconventional methods of abortion, but to go to a regular hospital for examination to see if medical abortion, abortion or induction of labor is needed. No matter which abortion method is used, it will cause great harm to the body.