how long is your period?

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i dont know if can i ask so personal question of girls,but i think none cant ask in mylot,so i wanna share some experience in life with friends in mylot,,my last period is not orderliness,coz you know last month start from2--7,,but this month from 9--today..compared the last month you know postponed for one week ,i dont what does it mean for the period time postponed,can you ask me,if someone specialized in the medicine so that is great...