Had Unprotected Sex. Urge To Urinate, Spotting, Back Pain. What Could This Be?

So I had sex with his guy, and he did not us a condom, Well one day later I had the tingle feeling down south, and it makes me feel like i need to pee every time but when i do only a little comes out, and when i wipe theres a little blood like spotting, and my stomach , It went alway for a day then it cam back, what could this be, I dont know if i have been feel hot flashes or any thing else, because when i work i work out in the sun, so i m always hot, but i felt like i was coming down with something and felt bad for a day.. and had back pains too