There are many reasons why your period is not clear for half a month, such as a previous caesarean section which may be caused by an incisional diverticulum, and this symptom may require a hysteroscopy for more than three months, and if the incisional diverticulum is found to be large, a diverticulum repair operation may be needed to restore the original number of days of menstruation. In addition, some endometrial polyps or submucosal fibroids may also cause incomplete menstruation, which requires ultrasound examination and hysteroscopic removal of polyps or fibroids to restore the original menstrual period. In addition, luteal insufficiency, endocrine disorders or adenomyosis, polycystic ovary syndrome, etc., may cause dysmenorrhea, which needs to be treated with progesterone or short-acting oral contraceptives such as eusebio, but it is best to use the medication under the guidance of a doctor.