Early pregnancy with black dirt may be physiological reasons, pre-miscarriage, ectopic pregnancy and cervical polyps and other causes. 1. Physiological reasons: early pregnancy black dirt outflow indicates that there is old vaginal bleeding, some women in the fertilization of the egg will appear in a small amount of vaginal bleeding, when the accumulation of vaginal time is longer will also be manifested as vaginal flow of black dirt, usually 3 ~ 4 days will disappear, do not need special treatment. 2. Pre-eclampsia: It may also manifest as dark brown vaginal discharge and may be accompanied by paroxysmal lower abdominal pain. Ultrasound examination will clarify the normal intrauterine pregnancy, and the combination of clinical manifestations, progesterone and blood HCG (human chorionic gonadotropin) level test may assist in the diagnosis. 3. Ectopic pregnancy: It can be characterized by a small amount of irregular vaginal bleeding, dark red or dark brown, accompanied by hidden pain in one side of the lower abdomen, which can be diagnosed by combining clinical manifestations, ultrasound examination and blood HCG test. 4. Cervical polyps: can also cause early pregnancy vaginal bleeding, when the blood accumulates in the vagina will also be manifested in the flow of dark brown discharge, not accompanied by lower abdominal pain, can be assisted in the diagnosis of gynecological examination and so on. When there is black dirt in early pregnancy need to go to the hospital in order to identify the cause and deal with it in a timely manner.