Brown discharge in pre-pregnancy may be a physiological phenomenon, but it does not exclude pathological factors such as ectopic pregnancy, preeclampsia and other causes. 1. Physiological phenomenon: the fertilized egg in the uterine endometrium may appear in the endometrial bleeding, generally less bleeding and a short period of time, so there will be a small amount of vaginal brown secretion, generally pregnant women do not have symptoms of abdominal pain, check the results of the blood HCG and progesterone is normal, you can not deal with it for the time being. 2. Ectopic pregnancy: If pregnant women have ectopic pregnancy, it will lead to a decrease in hormone levels, promote the endometrium shedding bleeding, thus appearing vaginal brown discharge, often accompanied by abdominal pain and other uncomfortable symptoms. 3. Pre-eclampsia: manifested as brown vaginal discharge, with or without abdominal pain, check the value of low progesterone, this time you need absolute bed rest, and under the guidance of the doctor to take medication to protect the fetus, such as progesterone and so on. Brown discharge in pre-pregnancy may also be caused by gynecological inflammation, cervical polyps and other reasons. If the pregnant woman has the brown discharge, accompanied by the above mentioned symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, for the cause of the treatment.