loosing my virginityyyy

Helpp!! so me and my boyfriend had sex for the first time on friday. i’m on the pill so we didn’t use a condom (we were each other’s firsts). he pulled out when he was cumming, none got on his belly and we both think he mightve got some inside. the morning after i took my pill and i have been but ive got really bad cramps and they dont feel like usual period cramps. am i over reacting or is it something else?? please comment whatever you have to say