Ovulation

I had sex twice unprotected during my ovulation. He didn't finish anywhere near me or have like a close call that he was about to finish. I've been having bad abdominal cramps for about two days after that happened. Should I be worried? We never use protection and are both well established and have been together 2.5 years. We aren't really trying but not super opposed to a baby either. These cramps just freak me out.