It’s not me?

So the last few nights I’ve had sex with my husband it BURNS. I’m wet we don’t use protection I’m on birth control and we’ve been together 6 years. I was just wondering why I’m feeling burning during and after sex? Is it my birth control? Should I get checked for an sti? We haven’t seen other people (as far as I know) just feeling sad and need help he’s not being the most honest lately and been hiding stuff from me