Menstruation delayed for 7 days, the possibility of pregnancy is higher, if there is unprotected sex women, the probability of pregnancy will be higher, at present can not be completely clear pregnancy. There are many reasons for delayed menstruation, and the most common reason is pregnancy, which can be determined by blood or urine testing for human chorionic gonadotropin. The earliest clinical sign of pregnancy is the cessation of menstruation, followed by nausea, vomiting and other reactions to early pregnancy, which can be clarified by ultrasonography and blood-related tests. Delayed menstruation is caused by menstrual disorders, such as sudden changes in the environment, drastic changes in diet, and overwork and late nights, which can be observed for a while, and if the duration of menopause is longer than 10 days, it is necessary to be alert to the possibility of pregnancy and other diseases.