My period is late by a month and I had my period for 3 years. Is there somthing wrong with me?

ANDY'S ANSWER: I'm going to go out on a limb here and assume that you are not sexually active so that there is no way you could be pregnant, right?  Lots of other things can affect your periods like stress, medications, illness etc. and usually it's nothing to worry about. However, if you miss another period, make an appointment with your doctor immediately and get yourself checked out.