Should I be concerned ?

Today I had sex with my bf (not the first time) , we decided to try a new position ( he one where I was on my back and he put my legs up) , after sex I started to feel pressure on my vagina , I ignored it because I thought it would’ve go away . Later on I started to get intense cramps and when I went in the restroom I saw I bled . (Enough to stain my underwear) . I don’t know what to think about it , could it have been that my cherry popped that time we had sex since he went fully in me , or could it be something else ? (Keep in mind he DID NOT come in me , we stopped before he even did and he was wearing a condom ) the bleeding stopped and so did the cramps . But I just don’t know what it could’ve been . Any ideas? 🤧