I went to the gynecologist, the ultrasound showed normal indicators, mild endometritis, and the microbiology test results were normal. Doctor, can you tell me what disease is the sign of black-brown discharge during menstruation? What should I see the doctor? How long can my condition last?

woman's normal menstrual cycle releases a mature egg (also known as an ovum) each month. But when there is anovulation or anovulatory disorder, menstruation occurs but there is no ovulation, resulting in female infertility.