If the ultrasound examination shows that the endometrial lining is 16mm thick, but the menstruation has been delayed, if the menstruation is delayed for more than 1 week and there is no contraception during the period, it is better to rule out the case of unwanted pregnancy first. It is recommended to come to the hospital to take blood test for HCG and progesterone. If accidental pregnancy is completely excluded, it may also be caused by endocrine disorder, abnormal ovulation or delayed menstruation due to no ovulation. It is recommended to take oral progesterone capsules or drospirenone tablets to promote menstruation, one tablet in the morning and one tablet in the evening for 10 days, and progesterone capsules of 200mg per day for 5 days. Progesterone can also be injected by intramuscular injection, 40mg per day for 5 days. If menstruation has already started during the medication period, the medication can be stopped in time.