Cum Burn?? 🔥🔥

Okay. So when i was younger my now husband and i never used birth control. We never really thought about the consequences. And he will always finish inside and i never had a problem. Fast foward to 10 yrs later and two kids. I definitely got on birthcontrol and was very exited not to use the pull out method any more. So i dont know what happened since then. It now burns inside every time he comes inside me. Obviously we had then got back to the same pull out method which for us worked 100% Now this sucks for him. I would hate to kill it for him having to worry about pulling out in time. Does anyone else know why this happens? Or has experienced this before? Can we do anything about it?