Burning sensation when bf cums in me

Idk if I’m allergic to my bfs semen because when we were first having sex it didn’t hurt when he would cum inside me. We’ve been together for just over 2 years and last year it started to burn. Obviously me being an extreme over thinker thought maybe we both gotta get checked but all the results were clear as I hoped. (Not that I don’t trust him just gotta check😂). So I just got him to stop cumming inside of me altogether. We’re gonna start trying for a baby after I graduate and at least work for a year+. If I do have a semen allergy will it affect my chances of getting pregnant. Plus I carry streptococcus group B in my vagina. Should I discuss things further with a doctor?

Thanks for reading ladies and all advice will be appreciated ❤️