Tested pregnant, but a bit of brown discharge may be a physiological cause of bleeding from the fertilized egg, but also may be ectopic pregnancy, preeclampsia and other pathological causes, need to be specifically analyzed. 1. Physiological reasons: the fertilization of the egg will stimulate the endometrium, which may cause small blood vessels to rupture and brown discharge. 2. Pathological causes: ectopic pregnancy, the most obvious symptom of preeclampsia is unexplained vaginal bleeding, a small amount of bleeding and secretions mixed with brown secretions, at this time may also be manifested in abdominal pain, lumbago and other symptoms. Tested pregnant, but a little brown discharge may have other reasons, can not be taken lightly, we should go to the hospital in time for ultrasound and other examinations, to identify the causes, symptomatic treatment, do not blindly use medication, in order to avoid adverse consequences.