The absence of menstruation for 3 months also excludes the possibility of conception. At this time, it is necessary to monitor the thickness of the endometrium by ultrasound before deciding whether or not to take menstrual stimulants. If the thickness of the endometrium is around 0.6-0.8cm, you can take oral progestin, such as progesterone capsules or dydrogesterone tablets, for 5-7 days, and normal menstruation will resume after stopping the medication. At the same time, if you have not had a period for such a long time, you should at least find out what the cause is, because when there is an endocrine hormone imbalance, it can also cause a lack of menstruation and a longer amenorrhea. As far as possible, endocrine hormones should be checked on an empty stomach when you go to the hospital to determine if there are any abnormalities in hormone levels, and depending on the situation, you can take short-acting oral contraceptive drugs for endometrial repair during the next cycle to regulate the artificial cycle to avoid such a situation for a long time, which can also affect pregnancy.