A small amount of vaginal bleeding after pregnancy may be a sign of preterm miscarriage. Ultrasound examination is needed to determine the development of the embryo and the presence of blood in the uterine cavity. If the accumulation of blood in the uterine cavity is small and there is no clear abdominal pain, it is only necessary to reduce activities, take more bed rest and take oral dydrogesterone or progesterone capsules to protect the fetus, and the accumulation of blood in the uterine cavity can be gradually absorbed over time. Therefore, if there is a small amount of bleeding in early pregnancy, pregnant women are advised to go to the hospital as soon as possible for an obstetric examination to determine whether the fetus is developing normally. If the fetus develops normally for the time being, it is possible to further determine whether it is caused by pre-eclampsia miscarriage or the pregnant woman’s own gynecological disease.