Women who have delayed menstruation, after ruling out pregnancy, can be helped by progesterone or dextroprogesterone. However, you need to seek medical advice to find out the cause, and should not blindly self-medicate. For women of childbearing age, especially those who have had unprotected sex, delayed menstruation must first rule out pregnancy, which is more likely if the period exceeds the previous menstrual cycle by more than 7 days. After pregnancy is ruled out, ultrasonography is recommended to measure the thickness of the uterine lining. If the thickness of the uterine lining reaches 8mm or more, oral or intramuscular progesterone or oral dextroprogesterone can be administered under the guidance of a doctor, and then the withdrawal of the drug can help the endometrium to retreat and bleed, thus facilitating the onset of menstruation. Because there are many reasons for delayed menstruation, it is necessary to go to the hospital in time to find out the cause of the disease, and scientifically and normatively remove the primary cause of delayed menstruation, so as to avoid delaying the disease and jeopardizing one’s own health.