What Causes Stinging In Vagina After Urinating And Foreplay?

I ve been having problems with my vagina stinging for a while after I pee sometimes and after my boyfriend fingers me. But it goes away after but is very uncomfortable. One time we were working out together and after we were done I peed and it stung a lot for a long time. I don t know why or what to do. He s not too rough when he does finger me and I m wet enough and he washes his hands frequently. I thought it was bacterial or something I m so annoyed by it, please help.