It is clinically normal to delay menstruation for 1 week at a time, because not every woman’s menstrual cycle lasts 28 to 30 days. If the menstrual cycle is not less than 25 days and clinically not more than 40 days, it is normal. As long as the amount of menstrual flow, the color of menstruation, and the time of menstruation are normal, clinically there is no need to intervene in this case, and it is recommended that if you are planning to get pregnant, you can choose to have coitus about 14 days before the next menstruation, and the chance of getting pregnant clinically will be increased. However, if there is a change in the amount of menstruation in addition to delayed menstruation, such as a significant decrease in the amount of menstruation, then this is a clinical abnormality and requires a sex hormone test and ultrasound, and then treatment according to the results.