The feeling of having a period in the abdomen one week after ovulation may be caused by impending menstruation, fertilized egg implantation, pelvic inflammatory disease and other factors. 1. The imminent onset of menstruation: some women have irregular menstrual cycles, and one week after ovulation, the level of sex hormones in the body changes significantly, which may cause the onset of menstruation, which may lead to the feeling of the abdomen as if menstruation is about to occur. 2. Fertilized egg implantation: one week after ovulation, if the sperm and egg combine to form a fertilized egg, the fertilized egg implanted in the uterine cavity, the development of progesterone, as well as the human chorionic gonadotropin gradually rises, which may affect the uterus and pelvic tissues to a certain extent, and this may cause the feeling of the lower abdomen like menstruation. 3. Pelvic inflammatory disease: if the female patient in the week after ovulation, pelvic infection by bacteria and other pathogens, lesions of the local tissue may appear inflammatory edema, oozing, may cause the abdomen like menstruation feeling. One week after ovulation, the abdomen feels like menstruation, the causes are more, need to go to the local public hospital obstetrics and gynecology.