Please Comment !!

I had protected sex April 24th , and it didnt last cause it hurt so we stopped. No ejuculation. I got my period May 5th and it lasted how it should of (5 days). And it was heavy bleeding enough to fill up a pad. 
This app has been showing me that ive been in my fertile week ( Sunday May 15th - Friday 20th) and Today being my ovulation day. But My stomach has been hurting , and i felt as i was nauseaous all week !!! But ive been just burping when i felt like somethin would come up. So could Ovulation be causing this ? Ive been so stressed about this. That was my first time having sex so i'm kind of like going bonkers i guess. No rude comments :)