help!

so today was the first time i had sex with my boyfriend and i’d just finished my period yesterday. we did use a condom but i have a slight burning sensation down there (??) it stings to pee and hurts on the inside too. we had oral sex too and i did some research online and it spoke about STIs and stuff but i just need a little advice as to what may have happened.

i hadn’t had sex in over 6/7 months too so i don’t know if it’s just because of his size and the fact he wasn’t very gentle? pls help!