Stubborn UTI

Georgia

So I had a UTI, and I got anti biotics and the symptoms seemed to go away for a day or two except for the blood in my urine. Then it came back. They put me on stronger antibiotics and pain meds for it. I'm scared this uti won't clear. How do I know if it's reached my kidneys? I don't feel anything wrong with me except for the pain during urination. I'm able to hold my pee again and it doesn't feel as urgent.