It is not normal to keep bleeding in pregnancy. If the bleeding occurs in early pregnancy, it may be a sign of miscarriage and a blood test for progesterone and an ultrasound should be performed. If the progesterone level is low, you should take progesterone to prevent miscarriage. During this period, it is also necessary to pay attention to bed rest, do not exercise strenuously, if the phenomenon of bleeding occurs in the middle and late stages of pregnancy, it is necessary to take drugs to inhibit uterine contractions, such as nifedipine or magnesium sulfate. Nifedipine can be taken orally, magnesium sulfate needs to be injected intramuscularly or intravenously to inhibit smooth muscle spasm, reduce the contraction of the uterus, with the effect of fetal preservation.