If the period has been accurate, a sudden delay may be a menstrual disorder. For women with a history of sexual intercourse it may be pregnancy and it is recommended to visit the hospital. If you have had sex, you should first have your blood chorionic gonadotropin checked to clearly diagnose whether you are pregnant or not. If the chorionic gonadotropin level is elevated, pregnancy is diagnosed and an ultrasound is performed to determine whether the pregnancy is intrauterine or ectopic. If the time of conception is short and the ultrasound cannot detect the basis of pregnancy, it is necessary to observe dynamically and wait for about 40 days of menopause to go to the hospital for ultrasound. If there are symptoms of abdominal pain, vaginal bleeding and other discomfort, go to the hospital promptly. If the blood chorionic gonadotropin value is normal to exclude pregnancy, consider menstrual disorders, ultrasound examination to understand the thickness of the endometrium, according to the results of the examination and then decide the specific medication, if necessary, check the female hormone six to understand ovarian function.