Whether to take progesterone for 5 days or 10 days needs to be judged according to the purpose of treatment and the specific cause of the disease. Before taking the medication, the time of taking the medication should be determined in combination with ultrasound examination and sex hormone 6 items. If the menstrual period is delayed for a long time, and the endometrial thickness is above 10 mm, and the possibility of pregnancy has been ruled out, you can take progesterone orally for 3-5 days continuously at this time, and usually menstruation will come around 3-7 days after stopping the medication; if the endometrial thickness is 5-8 mm, you need to take progesterone capsules orally for about 10 days, and due to the thin endometrium, you also need to take estrogenic drugs if necessary. In addition, menstrual irregularities caused by abnormal prolactin and abnormal androgens should not be supplemented with progesterone alone. Progesterone should be taken strictly in accordance with the doctor’s prescription and in accordance with the dosage, and should not be taken or discontinued casually to avoid irregular bleeding, while paying attention to regular review at the hospital.