burning while peeing?

i always try to pee after having unprotected sex, except today i did and it burned. like really badly burned. i think i might have a mild allergy to cum (if that’s even a thing LOL) bc it usually burns after sex but in a good way. maybe its just bc i havent had unprotected sex with my bf in a couple weeks, but still i don’t know what would’ve caused this. also we have only had sex with each other so theres no chance of stds