After ovulation took progesterone and brown discharge, may be a small amount of residual blood discharge in the uterine cavity, uterine cavity lesions, cervical lesions and other causes of the performance. 1. A small amount of residual blood discharged from the uterine cavity: during ovulation, sex hormone changes in a woman’s body may cause bleeding during ovulation. At the end of ovulation, a small amount of residual blood in the uterine cavity may be discharged through the vagina, which may cause brown discharge after taking progesterone. 2. Uterine cavity lesions: If female patients have endometritis, endometrial polyps, submucosal fibroids and other uterine cavity lesions, the end of ovulation took progesterone, the body’s sex hormone levels significantly change, may cause irregular shedding of the uterine lining, may be discharged a small amount of blood and secretions mixed with the formation of brown secretions. 3. Cervical lesions: If a female patient has cervicitis, cervical polyps, cervical cancer and other cervical lesions, the local tissue of the lesion is stimulated, a small amount of vaginal bleeding may occur, which may cause brown discharge. Female patients who take progesterone after ovulation and brown discharge, need to go to the local public hospital obstetrics and gynecology clinic in a timely manner.