It is not normal to have brown discharge at 12 weeks of pregnancy. The first thing you should do is to go to the hospital for an obstetric ultrasound to check the development of the embryo, to see if the fetal heartbeat is good, and to pay attention to the position of the placenta. At 12 weeks of pregnancy, if you have regular menstruation, the placenta may have formed by this time, and there may be a small amount of vaginal bleeding caused by the placenta growing closer to the cervical os. If the ultrasound is normal, it is advisable to take progesterone capsules and dextran tablets for proper fetal preservation if you plan to have a baby. You should pay attention to rest and avoid overexertion, and be careful not to have sexual intercourse. If the ultrasound does find that the fetal heartbeat is good and the placenta is low, you should also pay attention to the prohibition of sexual intercourse and pay attention to rest, there is no special treatment, and you can only rely on the placenta’s own growth to change its position. If the ultrasound does not reveal a fetal heartbeat, this is an indolent miscarriage and should be treated by hospitalization with medication for abortion.