After pregnancy, no matter how long it should not bleed, in early pregnancy, if there is dark brown discharge, consider that there is a pre-eclampsia situation, women need to test the thyroid series, chorionic gonadotropin, progesterone, combined with gynecological ultrasound to determine the development of the embryo. For women with progesterone deficiency or hypothyroidism in early pregnancy, they should be treated with active hormone supplementation. If a small amount of vaginal bleeding occurs in mid-pregnancy, women need to do ultrasound to rule out placenta hypoplasia or cervical polyps, cervical erosion and other conditions. If vaginal bleeding occurs in late pregnancy, it may be a precursor to labor. Usually 24-48 hours after the vaginal redness, the pregnant woman will experience paroxysmal, regular and gradually strengthening uterine contractions.