Please Help

I just got on birth control (the implant) and it’s effective- so my boyfriend and I tried sex without a condom. He came and then went back in and it started burning- it wouldn’t stop for about 30 minutes and burned when I peed.

We thought it was friction, so we tried again last night and the same thing happened. We put a condom on later that night for round two and I had no issues.

We both are tested and negative for any STDs or STIs. Do you think it’s from the birth control? Or is it possible I’m allergic to his semen?

I’ve been googling it like crazy and it looks like it’s a common thing, but no one has an answer for it