Early pregnancy bleeding, usually refers to vaginal bleeding within 3 months of pregnancy, has many causes, which may be related to physiological changes, miscarriage, ectopic pregnancy, etc.: 1. Physiological changes: 3-4 days after menopause (about 17 days after fertilization), pregnant women may have small amount of vaginal bleeding due to changes in estrogen, or bleeding caused by rupture of blood vessels around the fertilized egg in the process of forming embryo. It can be normalized by resting in bed for a few days and does not require any special treatment. 2. Miscarriage: It is mainly a pre-eclampsia miscarriage, manifested by a small amount of vaginal bleeding, which may be accompanied by dark red or bloody leucorrhea, paroxysmal lower abdominal pain, low back pain and a feeling of falling. If the embryo is poorly developed, there will also be a little bleeding in the indolent abortion, which needs to be identified by ultrasound. 3. ectopic pregnancy: the fertilized egg is laid outside the uterine cavity to form an embryo, which can cause local rupture during the growth of the embryo, resulting in vaginal bleeding and timely hospitalization. 4. gravida: it is relatively rare, formed due to the occurrence of blister-like edema and trophoblast proliferation of placental villi of different sizes, resembling bunches of grapes. It is manifested as vaginal bleeding is mostly irregular, intermittent and the amount of blood is not fixed; 5, cervical lesions: abnormalities in the cervix, such as chronic cervicitis, cervical polyps, cervical cancer, etc. may cause bleeding. It is recommended that those who bleed in early pregnancy routinely perform gynecological examinations to check whether there are lesions in the vaginal wall and to check the condition of the cervix; 6, other: alcoholism, misuse of drugs, etc. can also be a cause of vaginal bleeding. When there is vaginal bleeding in early pregnancy You should go to the hospital in time to avoid adverse conditions.