It is normal for menstruation to be delayed by one week each month. A woman’s menstrual cycle is affected by the hormone levels of her ovaries, and it is normal for the menstrual cycle to be within 21-38 days. The menstrual cycle is normal within 21-38 days. Because the function of the ovaries is different for each woman, early or delayed menstruation may occur. If the menstruation is fixed and delayed every month, it means that the regularity of the ovaries takes 37 days, so it is a normal menstrual cycle. In the case of fixed postponement, there is usually no effect on the body and it will not have any effect on pregnancy. However, because of the delayed menstruation, ovulation is also delayed, so these patients with delayed menstruation will usually find a discrepancy between the size of the baby and the time of menopause when they become pregnant, and may need to reaccount for the expected date of delivery.