I had sex with my boyfriend multiple times a few days ago, soon after I experienced pain inside my vagina and thought it was just a cut. But then it started really stinging when urinating and I noticed the inside of the bottom part of my vagina was red and sore. I went to a sexual health clinic the next morning and a nurse said I might have genital herpes. The only person I have had sex with is my current boyfriend and he was tested directly before we started having sex for STDs and was clean. I don't understand how I would have got genital herpes if he was clean and we've been having sex for over 2 months and this is the first sign of a problem.
I have done some research and found that UTIs sometimes have similar symptoms to those I've been experiencing - stinging when urinating, odour when urinating first thing in morning. And also that they're common after being at a festival (I went to one a week ago)
But I'm confused as to what is wrong with me, please help!