Brown discharge during pregnancy is counted as vaginal bleeding, and a little vaginal bleeding at full-term pregnancy is redness, which is a sign of preterm labor. 1, late pregnancy, before and after the expected date of delivery, vaginal brown discharge without obvious causes, that is, see red. Seeing red is a sign of premonitory labor, that is, a sign that the pregnant woman will soon be officially in labor. Common symptoms of preterm labor include false labor (irregular abdominal pain that often occurs at night and disappears in the morning), and a feeling of the fetus descending (also known as a sense of relief). 2. The red color is caused by the peeling off of the fetal membranes near the endocervix from the uterine wall there, the rupture of capillaries, a small amount of bleeding and mixing with the mucus plug in the cervical canal, and discharge through the vagina. It is a more reliable sign that labor is about to begin. Most pregnant women go into labor within 24-48 hours after seeing red, and a few have to extend it to a week. 3, pregnant women in late pregnancy after the brown discharge, need to consult a doctor in time, the doctor will carry out relevant examinations to clarify the cause of bleeding; late pregnancy vaginal bleeding should be except for some pathological conditions, such as placenta previa, placenta praevia, at the same time should be monitored the fetus fetal intrauterine condition and the intensity of the contractions, such as through the exclusion of the common pathological conditions, the main consideration of the late pregnancy vaginal brown discharge is to see red. 4, primigravida often in the red after several days without labor manifestations, as long as the fetal movement is normal, fetal heart rate monitoring response is good, the amount of vaginal red is not much, we should follow the doctor’s advice, patience and wait.