What does it mean when your period is two days late and you had little cramps and still no period and you are now three days late for your period?

Well: You are young. Up to present were your periods always regular or this "irregularity" is a first one? If yes, and if you had unprotected sex, wait a few more day and if still "nothing" go get a home test and check for pregnancy. If you had no sex at all and if you have no other symptoms i would wait. Girls at your age could still have irregular periods. See what happens in the next month's cycle.