If the delayed menstruation is anovulatory, progesterone is very effective. Delayed menstruation of anovulatory nature means that the patient does not produce ovulation, without ovulation, there is no corpus luteum, and without corpus luteum, there is no progesterone to protect the endometrium, and prolonged lack of progesterone to protect the endometrium will easily lead to endometrial pathology, and even endometrial cancer. Therefore, for anovulatory delayed menstruation, it is recommended to apply progesterone regularly in the second half of menstruation to protect the endometrium, and progesterone is usually used for treatment. If the delayed menstruation is caused by pregnancy, such as checking the blood HCG value, HCG value rises, in this case taking progesterone also can not come to menstruation.