The time of menstruation delayed one week and within, if there is no pregnancy is not accompanied by other abnormal symptoms are normal phenomena, menstruation delayed, but there is a brown discharge is not normal performance, the possible causes of this situation mainly include: a. If there is a history of sexual intercourse, it is possible to be pregnant after the symptoms of miscarriage. You can go to the hospital to do blood HCG test or urine early pregnancy test and ultrasound, clear diagnosis. If the diagnosis is pregnancy with symptoms of pre-eclampsia, it is necessary to carry out fertility preservation treatment or observation according to the actual situation; second, gynecological diseases such as endometritis and minor uterine adhesions, which cause menstrual disorders, leading to delayed menstruation, poor menstrual blood flow, which may be accompanied by symptoms of abdominal pain; third, a variety of reasons affecting the ovary’s function of secretion of estrogen and progesterone, leading to delayed menstruation, menstrual blood of an abnormal color.