Possible pregnancy???

Me and my ex recently broke up and on the 8th and 9th we had sex unprotected. I hadn't paid attention but just so happens I was ovulating that week. i should have known better I usually only have a sex drive near my period. Well now I've been nauseated on and off extremely emotional tender breasts exausted and not really much of an apatite and my period is three days late on the day of my missed period I felt like total crap and my overies felt like they were going to burst it hurt so bad I know it's definitely possible I just wanted some input and advice I also know that stressing does throw off your period