Brown discharge in the second month of pregnancy may be uterine residue, but brown discharge in the second month of pregnancy does not rule out pre-miscarriage or other causes. When the embryo lays down and erodes through the lining of the uterus, the blood vessels rupture a bit, causing a small amount of blood to accumulate in the uterine cavity or vagina and slowly turn into a brownish colored discharge, which is then discharged. The brown discharge at this time is uterine residue, such as uterine residue, the amount of brown discharge is relatively small, and the body does not show other symptoms. Brown discharge in the second month of pregnancy may also be a pre-eclampsia or gynecological disease, if it is a pre-eclampsia, in addition to brown discharge, pregnant women will also have lower abdominal pain and other symptoms; if it is a gynecological disease, pregnant women may be accompanied by other gynecological symptoms, such as itching of the vagina, and so on. It is recommended to pay attention to the brown discharge in the second month of pregnancy and go to a regular hospital for examination in time.