could I be pregnant?? HELP!!!!

so I have 2 kids, 2 & 4. you'd think I'd already know the symptoms. well me & my bf had unprotected sex everyday of my period (July 14th - July 18th) and everyday since. it says im in high fertility and that I ovulate on the 28th. but im already having cramps on my left side... could I already be pregnant or do u think im currently ovulating? I've also been having diarrhea the past 2 days... please help.