Happens sometimes: A regular period could occur every 21 to 35 days. Periods rarely start on the same exact day every month. Sometimes they are few days off and still be normal. Because you are so young, your hormonal system has not matured and you are more likely to have irregular periods but they will get more regular as you get older. As long as you are not pregnant and are on reliable birth control don't worry.
Answered 7/22/2014
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