There are the following reasons for brown discharge in the second month of pregnancy: in the first case, it is caused by cervicitis or vaginitis, which leads to mucosal damage and rupture of small blood vessels. In the second case, brown discharge can also occur when a woman has a preterm miscarriage and embryonic abortion. If brown discharge appears in the second month of pregnancy, it is necessary to go to the hospital for gynecological examination and gynecological ultrasound and HCG examination as soon as possible. If it is caused by the first condition, anti-inflammatory drugs should be given to treat vaginal inflammation and cervical inflammation to avoid uterine cavity infection. In the second case, appropriate bed rest and progesterone medication should be given to keep the fetus alive. If the embryo can continue to grow and develop after fetal preservation treatment, the pregnancy can be continued; however, if embryonic abortion or unavoidable miscarriage occurs after fetal preservation treatment, the pregnancy should be terminated in time.