If the menstrual cycle is regular, if the menstrual cycle is more than 10 days without a period, we should do a urine early pregnancy or blood test for HCG (human chorionic gonadotropin) to see if it is early pregnancy, if it is early pregnancy, the pregnancy can be continued if there is a pregnancy plan, if there is no pregnancy plan, abortion can be done at a later date. 2. If early pregnancy is ruled out, the delay in menstruation is due to menstrual disorders and delayed cycles. You can treat with progestin for about 1 week and stop taking it for 3-7 days to see if there is a return of menstruation. If menstruation resumes in this case, observe the regularity of menstruation in the future. If you do not have a period after the medication, you should have a hormone test to see if the hormones in your body are disordered and decide on the next step of treatment.