Brown discharge in early pregnancy is a sign of little vaginal bleeding, which is an abnormal reaction. It may be caused by cervical erosion, bleeding at implantation and preeclampsia. 1. Cervical erosion: Cervical erosion refers to ectopic cervical columnar epithelium, not really erosion, is one of the most common reproductive tract diseases in women. It can cause some brown discharge in the vagina of women, and it is recommended to go to the hospital to check it and then treat it as early as possible. 2. Bleeding on implantation: Bleeding on implantation is the phenomenon of pink and brown blood coming out of the vagina of pregnant women when the fertilized egg reaches the uterus through the fallopian tube for implantation. Only a small number of pregnant women will have implantation bleeding in early pregnancy due to physiological and physical problems. Usually there is no special reaction to the bleeding and no special treatment is needed. However, if the brown discharge is excessive, you should go to the hospital for examination to find out the cause. 3. Pre-eclampsia: Brown discharge is sometimes a manifestation of preeclampsia, especially when a woman has abdominal distension as well as a feeling of falling in the abdomen at the same time, she must pay attention to vigilance and needs to go to the hospital immediately for examination. If you notice brown discharge, you should go to the hospital as soon as possible for examination to determine the cause of the brown discharge and treat it as soon as possible according to the cause.