If the ultrasound examination shows that the endometrium is 16mm thick, but the menstruation has been delayed, if the menstruation has been delayed for more than 1 week, and during the period of sexual intercourse without proper contraception, it is best to rule out the possibility of unwanted pregnancy first. It is recommended to come to the hospital to take blood tests for HCG and progesterone. If the case of unwanted pregnancy is completely ruled out, the delayed menstruation may also be caused by endocrine disorders, ovulation abnormalities, or the absence of ovulation. It is recommended to take oral progesterone capsules or dydrogesterone tablets to promote menstruation, dydrogesterone tablets are 1 tablet in the morning and 1 tablet in the evening for 10 consecutive days, and progesterone capsules are recommended to be taken orally at 200mg per day for 5 consecutive days. In addition, it can also be injected by intramuscular progesterone injection, 40mg per day, continuous intramuscular injection for 5 days, if the use of drugs during the period of menstruation, you can stop the drug in time.