The 10-day early menstruation after sex is not related to sex itself, because sex is a normal physiological activity and does not affect menstruation accordingly. If the period is 10 days early, it may be caused by endocrine disorder or the use of birth control pills. In addition, the presence of uterine fibroids may cause early menstruation with increased menstrual flow and blood clots. In addition, some blood disorders, such as blood clotting disorders and thrombocytopenia, may cause early menstruation. Patients are advised to go to the hospital for examination to understand the cause of early menstruation and to give appropriate treatment according to the cause. Generally, it is normal for a woman to have her menstruation three days early or three days late from the original one, while 10 days early is abnormal.