Brown blood in the leukorrhea in early pregnancy is mostly a normal physiological phenomenon. There are two common reasons for this: First, the fertilized egg in early pregnancy lays in the inner wall of the uterus, causing a small amount of endometrial shedding, resulting in vaginal bleeding and brown blood in the leukorrhea. Second, the increased levels of estradiol, progesterone and human chorionic gonadotropin in the body in early pregnancy lead to thickening of the endometrium and also cause edema of the mucous membrane of the cervix, fallopian tubes, ovaries and vaginal tissues, increasing secretions, which may also cause capillary rupture and bleeding, some of which are accompanied by symptoms such as lumbago and abdominal pain, and a few patients have symptoms such as foul-smelling leukorrhea and itching of the vulva. If you have these symptoms, you should consider whether you have substantial lesions such as vaginitis or cervicitis, and a routine examination of secretions is needed to confirm the cause.