The presence of brown blood before menstruation indicates the presence of endocrine hormone imbalance and luteinizing body insufficiency, which may cause brown discharge and bleeding due to progesterone insufficiency. If you have low progesterone, you should start taking oral progesterone or progesterone twice a day on the 11th day, 100mg a time, and stop taking it after 10 days of treatment for 3 months; at the same time, you can also take the artificial cycle, which is progesterone plus Glaxo for 3 months, and after you stop taking it, you can observe the effect of the medication. If there is no recurrence, there is no big problem and it will not affect the future pregnancy or the growth of the lining.