When brown vaginal discharge occurs in early pregnancy, you need to find its cause and then treat it according to the cause. The main causes of vaginal brown discharge at 12 weeks of pregnancy can be divided into the following categories: first, pre-eclampsia miscarriage. Before the miscarriage, the patient will have a small amount of vaginal bleeding, and the blood and vaginal discharge will be combined to form a brown discharge, which is one of the signs that indicate pre-miscarriage. Therefore, after the appearance of brown discharge, it is necessary to seek medical attention and perform gynecological ultrasound to rule out fetal abnormalities and, if necessary, hospitalization for fetal preservation. Second, cervical polyp. Cervical polyps can cause a small amount of bleeding during pregnancy, which can lead to brown discharge. If the brown discharge is confirmed to be caused by cervical polyp, cervical polyp removal can be performed in the gynecological clinic. Third, serious gynecological inflammation. When the gynecological inflammation is serious to a certain extent, it can lead to vaginal mucous membrane congestion and brown discharge. When this happens, you need to seek medical attention and give topical suppositories to relieve and reduce the symptoms. If the hospital does not have ultrasound, you can try to listen to the fetal heart by Doppler, if you hear the fetal heart, it indicates that the fetus is alive. In summary, the brown discharge at 12 weeks of pregnancy does not require excessive alarm, but requires the patient to seek medical attention to identify the cause and treat it according to the cause.