Nervous

Please, I need help. I've been having sex with two guys. Yes, I understand but it's been spaced out. So, my first one had been tested and didn't have anything. The second one, said that he had been tested and it came back all negative. That being said, when I got off my period, I started having like an annoying burning sensation or like a tingling burning in my vagina but it doesn't burn while I pee. It just is noticeable when I'm sitting down or laying in bed. Nothing to do with me using the restroom. Please someone help me understand.