Brown discharge on the 37th day of pregnancy may be caused by preeclampsia, ectopic pregnancy, etc. The patient should consult a doctor in time to clarify the cause of the disease and then carry out appropriate treatment. 1. Pre-eclampsia: a small amount of vaginal bleeding that occurs before the 28th week of pregnancy can be brown, and the patient will also have lower abdominal pain, lumbago and other symptoms, this group of people should pay attention to rest, the use of dextroprogesterone, progesterone, and other drugs for treatment. 2. Ectopic pregnancy: if the patient in addition to vaginal brown discharge and abdominal pain, anal distension and other symptoms, ultrasound suggests that there is no fetal sac in the uterine cavity, other parts of the suspected mass, should be considered to be caused by ectopic pregnancy, should be prepared to terminate the pregnancy as soon as possible. The medication and operation should be carried out under the guidance of a doctor.