Hello...My menstrual period only lasts about 3-4 days and is normal cramping the first day which i'm very fortunate for but this month the cramps were severely painful, period only lasted 2 days, the second day wasn't much at all (to be honest didn't even have to use a tampon) and it's been 2 days since is over and i'm still cramping and sometimes is painful, a bit nauseous and feeling very dizzy. My boyfriend and I have been having unprotected sex for the past few months. Any ideas what this might be?