Delayed menstruation is not always caused by pregnancy, but if a woman of childbearing age experiences delayed menstruation, pregnancy should be ruled out first. Usually for women with regular menstrual cycles, pregnancy can be determined by relevant early pregnancy tests around 7 days after menopause. Menstrual disorders, gynecological diseases, and pregnancy can cause delayed menstruation. Under normal circumstances, it is normal for menstruation to be early or 1 week late by mistake. Therefore, it is not possible to diagnose whether you are pregnant by the number of days of delayed menstruation alone. If the menstrual cycle is normally regular and no contraception is used during sexual intercourse, pregnancy should be highly suspected if the period is delayed for more than 1 week. Further combination of urine pregnancy test, blood HCG value or gynecological ultrasound is needed to further clarify the diagnosis. A hospital visit is usually recommended to check the blood HCG value. If the blood HCG level rises, it is indicative of pregnancy. To clarify whether it is intrauterine pregnancy, an ultrasound is recommended about half a month after the menstrual period is delayed. If the menstrual cycle is significantly prolonged and pregnancy is ruled out, an ultrasound examination and related endocrine examination can be done at the hospital to clarify the cause and give the appropriate treatment.