I Had Unprotected Sex With A Guy Who Has Multiple

I had unprotected sex with a guy who has multiple sexual partners as does not like wearing condoms. That was four days ago. Now, my pee is very dark colored. I also have a constant minimum pain on my vagina, and it itches so bad and whenever I itch it, it burns. Like really burns. I'm so scared that I got an STD. Could this just be a UTI??