The brown discharge in the underpants at 8 weeks of pregnancy is caused by preeclampsia and requires medication to preserve the fetus, ectopic pregnancy, cervical polyps caused by conservative treatment or surgery according to the condition of the medication. 1. Pre-eclampsia: The symptom of brown discharge from the underpants at 8 weeks of pregnancy suggests that there is a small amount of vaginal bleeding, and in the case of pre-eclampsia it may be accompanied by paroxysmal lower abdominal pain, which can be diagnosed with the combination of clinical manifestations, ultrasound, and progesterone and blood HCG tests. It is necessary to follow the doctor’s advice to rest properly, and give progesterone and other drugs to protect the fetus treatment. 2. Ectopic pregnancy: it can also cause a small amount of vaginal bleeding, accompanied by one side of the lower abdomen pain, combined with ultrasound, blood HCG and vaginal fornix puncture can assist in the diagnosis. Depending on the condition of the patient, medication such as methotrexate or laparoscopic or open surgery may be prescribed. 3. Cervical polyp: It can also cause small amount of vaginal bleeding, which can be repeated and not accompanied by abdominal pain and other symptoms, and gynecological examination can assist in the diagnosis. When repeated bleeding need to follow the doctor’s orders for the removal of cervical polyps, and the removed tissue will be sent to the pathological examination. When you are 8 weeks pregnant and have brown discharge in your underwear, you need to go to the hospital to find out the cause and treat it promptly. The medication should be prescribed by the doctor.