Urinary tract infection (UTI)?

So I had sex yesterday and I didn’t pee afterward. I know, stupid me. Today it’s been hurting to pee, like it stings, and I’ll have the urge to pee but only a little would come out. I would wipe and there would be like a very small amount of blood. What can I do to get rid of this without having to tell my parents or go to the doctors?