I think i may have jus startef my period, i was late 3 days. i am not bleeding as heavy though but my boobs hurt so bad.

May be: If you are not pregnant- absolutely you may be right. Breast pain can happen during period time- due to your hormones. Cut down caffeinated beverages, mint, chocolate, tea etc to reduce breast pain. Take nsaids as needed for breast pain.

Yes, correct: You may have just had a slight, normal delay in your period and those symptoms are not so unusual. If you are sexually active, though, you must check a pregnancy test.