Burning sex? 😞

Ugh... I don’t know what to do. My boyfriend and I were having sex a lot up until about 25ish weeks, it started to burn to have sex. It does not feel like a UTI or anything, and I only have the burning sensation during and for 15-20 mins after... I’m going to ask my doctor next week when I see him. But its just completely turned me off from wanting to have sex because I just feel like it’s going to hurt if I do. I just wanna be able to enjoy it before I can’t for those 6 weeks! 😭 any tips?