Generally, menstruation delayed within 7 days is normal, if delayed for more than a week, during the period of sexual intercourse without contraception, first of all, to rule out the possibility of unwanted pregnancy. If you are pregnant, it is useless to take progesterone, because progesterone is a drug that promotes menstruation, but it is also a drug that protects the fetus. If you’re pregnant and have delayed menstruation, progesterone can’t induce menstruation, so first of all, you need to rule out accidental pregnancy, usually more than 12 days after the last intercourse, you can come to the hospital to take a blood test for HCG. if you completely rule out pregnancy, it’s best to do an ultrasound of the uterine adnexa. If the endometrial thickness is moderate, you can take progesterone to promote menstruation, usually 200mg per day orally for 5 days, or intramuscular progesterone injection, 40mg per day, 3-5 days of intramuscular injection.