Brown discharge in the third month of pregnancy is not normal, you must go to the hospital as soon as possible for ultrasound and vaginal examination. At this time, there may be preeclampsia, embryo stops developing or placenta hypoplasia, or cervical inflammation, pre-cancerous lesions of the cervix, and the cause must be clarified as soon as possible and treated later. If it is preeclampsia, the baby should be kept alive; if it is placenta previa, rest should be paid attention to and the bleeding should be closely observed. Generally, as the month grows, the placenta will rise and the bleeding will stop. In case of inflammation of the cervix or precancerous lesions of the cervix, the next step of treatment must be determined according to the results of the examination, which can be done by precancerous screening of the cervix at this time. If the cervix is purely precancerous it is possible to observe it, wait until 42 days after delivery, review it again and then treat it.