Consider pregnancy: Any time periods change in someone your age you have to consider pregnancy. The time just before menstruation is when your body is primed for conception, and pregnancy can happen even when using contraception. Many other things can change your period including just a normal process, but do a home pregnancy test.
Answered 12/29/2013
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Many things: Stress can supress your cycle. Weight change either diet or gain may alter the cycle. Medications can alter the cycle and some women are sensitive to weather temerature changes. See if you have a normal period in jan.
Answered 5/12/2015
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