Black discharge in pregnancy suggests that it is an abnormal manifestation, because it is not normal to have such a discharge. When this kind of discharge appears, it suggests that there is a chance of pre-eclampsia, which may be caused by overexertion or decreased resistance, as well as vaginal inflammation, external stimulation during coitus, and low progesterone or decreased blood HCG, all of which may cause black-brown discharge. This situation should be taken seriously, it is recommended to go to the hospital registered obstetrics blood test progesterone, blood HCG. if the pregnancy has been in about 40 days, try to do ultrasound, to ensure that the stability of the fetus, according to the situation to take a certain amount of oral preservation of the fetus medication for preservation of the fetus. When you go back, you must not be too tired, keep your bowels clear, so as not to force the bowel movement, which can also cause bleeding.