came inside me 5 times? it started burning?

Kaylyn • 20, little/kitten, licensed cosmetologist and Wiccan 🌙
I'm on the pill, I have been for 6 months and take it the same time everyday. My boyfriend, being the idiot he is, came inside me five times Friday, without letting me know. I know some girls let their boyfriends cum inside them every time. I want peoples opinion on if they think I'm okay, or if I should go out and get a plan b pill? Also, every time he cums inside me it burns. I've never had a UTI, nor think I have one, the burning feeling only lasts about 1-3 hours after sex.