If your period is 11 days early, it is most likely due to luteal insufficiency, which is often caused by environmental changes or emotional changes. If it happens once in a while, don’t be nervous, know the volume and color of your menstruation, and if there is no abnormality, observe if the next menstrual cycle is normal. Tumors of the pelvis can also cause early menstruation. Therefore, it is necessary to go to the hospital for the appropriate examination to find out if there are any abnormalities in the uterine adnexa and cervix, and then to deal with them.