Bleeding during pregnancy should first be considered as a sign of miscarriage, preterm labor or labor. In the case of preterm labor, miscarriage or labor, it is often accompanied by tenderness and discomfort in the lower abdomen or painful contractions. Bleeding should be investigated to determine the source of the bleeding, whether it is from the cervix or the uterine cavity. If the bleeding is from the cervix, local pressure can be applied to stop the bleeding. If the bleeding is from the uterine cavity, an ultrasound is necessary to find out the position of the placenta. If the bleeding is caused by the low position of the placenta, hemorrhage may occur at any time, which is life-threatening to the fetus as well as the mother. Therefore, it is recommended to actively consult the doctor to find out the cause and hospitalize the patient if necessary.