Bleeding during pregnancy is abnormal and should be treated promptly to avoid affecting the growth and development of the fetus. If bleeding occurs in early pregnancy, you need to check the values of progesterone and HCG, if these two values are low, you should take oral progesterone or intramuscular injection of progesterone to protect the fetus. If the value of HCG doubles badly, in this case it is necessary to inject human chorionic gonadotropin intramuscularly to promote the growth and development of the fetus. If bleeding occurs in mid-pregnancy, it is more common at this time to have a miscarriage or placental abruption, and if the stomach pain is severe it indicates that a miscarriage is the cause. If the vaginal bleeding is painless, it is considered to be marginal placenta previa, and this situation needs to pay attention to bed rest. If bleeding occurs in the late stages of pregnancy, it is considered to be the manifestation of preterm labor, and should be promptly used to inhibit the contraction of uterine smooth muscle drugs to protect the fetus.