Taint (i think its called??) very tmi subject

Okay so i had sex like last night, but the guy i was with attempted to, say, 'stretch' me out? 
Basically, 4 fingers, and occasional thumb too! (Yes, it hurt but i could deal)
And now it feels like that little bit between my vagina and butthole is swollen? Im not sure if im imagining things but if anyone knows what could be going on?😂