Help me please

Okay so me and my boyfriend just had sex after I just got off my period . And so we had sex and it felt really good and then towards the end I started to feel burning alittle . But I didn’t think it was anything . So he ended up cuming and then an hour later we both were in the mood to have sex again and I wasn’t getting wet so I put this lube on and it burned so bad . Theirs no way I can have an std . He was tested and so was I were both clear . But I did shave earlier . Is that the reason why it burns . It burns like where I pee . And it burned to pee after so bad . I don’t have the frequent urge to pee but I’m wondering is theirs something more wrong with me ?