If you experience a small amount of vaginal bleeding before your period, it does not necessarily mean that you are clinically pregnant. The most common cause is a small amount of premenstrual bleeding due to luteinizing insufficiency. Clinically, it is recommended that a blood test for progesterone be taken to find out if the premenstrual vaginal bleeding is due to progesterone insufficiency. For this condition, you can take progesterone orally for treatment 1 time/day after ovulation, 2 capsules/time for 10 days, then you will have your period 3-7 days after stopping the medication and for 3 consecutive menstrual cycles, which can effectively treat the condition of small amount of bleeding before menstruation caused by luteal insufficiency. This condition is also seen in endometriosis, or submucosal fibroids, endometrial inflammation, endometrial polyps may cause vaginal bleeding before menstruation, if necessary, ultrasound or diagnostic scraping is recommended for diagnosis.