Small amount of vaginal bleeding in pregnant women may be related to cervical polyps, bacterial infection, pre-miscarriage and other factors, patients can be treated by using anti-inflammatory drugs, progesterone, surgery and other ways. 1. Cervical polyps: After pregnancy, the cervix is congested with blood, which can easily lead to cervical polyps. If there is a small amount of bleeding, it is usually necessary to take bed rest, keep the vulva clean, and then perform polypectomy after delivery. 2. Bacterial infections: Bacterial infections that cause vaginitis or cervicitis may also lead to a small amount of bleeding, which can usually be treated with antibiotics such as amoxicillin. 3. Pre-eclampsia: Pre-eclampsia may occur during pregnancy due to insufficient progesterone, which can be injected intramuscularly or taken orally to protect the fetus. If the premonitory miscarriage develops into inevitable miscarriage, the patient can undergo curettage if necessary. It is recommended that the patient go to the hospital as soon as possible to clarify the cause of the disease and actively cooperate with the doctor for treatment.