Diagnosed with UTI, could it be kidney infection or bladder??

Anita • The Sweetheart❤️
I went to the Urgent Care and wen due to vaginal itching/irritation, some urine frequency but no pain. The PA gave me a urine dip stick test and it came back showing leukocytes and a small amount of protein in the levels. By the test results, he diagnosed me with a UTI and I'm taking antibiotics 7 days. But my urine culture was negative.  I'm worried because I'm reading scary information about what this could be. I am very scared to see a urologist because I didn't know I had a UTI and then I don't want kidney problems and I'm worried. 
Help.