hello! The length of the menstrual cycle, depending on the length of ovarian cycles, usually 28-30 days, but varies, there are 23-45 days, or even three or six months to one cycle. As long as a regular, normal menstruation generally. We recommend that you clean after 2-3 days of menstruation can be checked to confirm the diagnosis. "My goal for your needs," Beijing Mary Fuyingyiyuan experts sincerely serve you!