Menstruation is not normal for two months, normal menstrual cycle usually does not exceed 35 days, if there is no sexual life is considered to be menstrual disorders, at this time it is recommended to directly draw blood to check the six sex hormones, including luteinizing hormone, follicle stimulating hormone, progesterone, estradiol, prolactin and testosterone, combined with ultrasound examination to determine the cause of menstrual disorders. The common causes of menstrual irregularities are polycystic ovary syndrome, decreased ovarian reserve function, and hyperprolactinemia. If you have sex during ovulation and have delayed menstruation, it is recommended to have blood tests for chorionic gonadotropin, sex hormone six and ultrasound on an empty stomach more than 12 days after intercourse to determine whether the cause of delayed menstruation is pregnancy or menstrual irregularities.