Frequent pee?

Hello, so I had sex a couple of days ago and my boyfriend finished in me. I took a plan b the next morning but I was ovulating already and I did research and it had said that they usually don’t work if you are already ovulating. I know it’s too soon to know if I’m pregnant or not but I am having to constantly pee but nothing comes out. Any ideas of what that could be? pregnancy or UTI? Please help