Welcome to the ehealthforum and I am glad to help you. Though a standard menstrual cycle is considered to be of 28 days.
There are a lot of variations which are also considered within certain limits. Normal cycle is considered to be 21 to 35 days length, calculating from the first day of menstruation till the other first day of menstruation.
Hence, you can get your next periods anywhere from 21 days to 35 days after the beginning of the last menstruation. I sincerely hope that helps. Take care.
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