Two days late is nothing. Periods can be late due to any number of things.......increased physical activity, stress, illness, hormonal fluctuations, etc etc. Sometimes you can miss a whole period altogether (this has happened to me a couple of times). Honestly, calm down. If in a couple of weeks, you still haven't gotten it, take a pregnancy test just to be sure. But I'm willing to bet you'll get it before then.

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Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi