Brown discharge in the first trimester of pregnancy is usually not uterine residue. Brown discharge in the first trimester of pregnancy is considered to be the occurrence of preeclampsia, ectopic pregnancy and other conditions. 1.aura miscarriage, the first trimester of pregnancy, due to the development of the fetus is not stable, may lead to a small amount of placenta and endometrial stripping bleeding, so there may be brown discharge symptoms, and is not produced by the uterine residue. 2. Ectopic pregnancy, during pregnancy if the fetus is not in the right place, ectopic pregnancy, the endometrium will be shed, so there will be brown discharge, vaginal bleeding phenomenon. Usually need to pay more attention to rest, during pregnancy need to regular medical checkups, but also need to observe more personal physical condition.