Possibly.: Not sure what your lifestyle change has been for the last three months, but only the most *dramatic* changes (extreme weight loss, becoming a hardcore runner, etc) might cause your menstrual cycle to stop. If you have been sexually active, you need to check a pregnancy test because one of the most common reasons for no menstrual cycle is pregnancy. If you haven't, time to see a doctor to evaluate.
Answered 1/23/2014
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