I think I have a UTI?

I have met someone new and there were times after I had sex with him I wouldn't pee (stupid I know) yesterday I had that bad burning feeling when I went to pee and I drank lots of water and the pain did subside so I ignored it which was also stupid of me I just thought it was all irritated from so much sex but I was wrong lol. So today there was some blood in my urine and some when I wiped, im having a constant urge to pee and when I do it's a tiny amount and it hurts towards the end. I'm going to the doctor tomorrow but I'm afraid that I waited too late and it spread to my kidneys or something idk I never had this before :( is there anything I should do to help somehow in the meantime?