what the hell is happen ing

tori

okay, so I was ovulating and had sex on the 16th and 17th, which were the most fertile days....tonight and well now, this morning I'm up with the shittiest cramps. they aren't bad, but they're unpleasantly annoying and my period isn't due til the 1st...my periods rarely give me cramps and are light lasting up to 2 days....did sex earlier knock an ovary out of whack or could I maybe be pregnant??