I am not sure if i have a kidney infection?

I have bin feeling a very very slight pain in my blatter for about two weaks now. It did not really hurt at all. But now i have this VERY slight pain in my lower left side of my back. My pee looks fine and i do not have a fever and there is no pain or blood when urinating. Do you think i have a kidney infection? Also i have a phisical some time next week soow i am going to the doctor soon. I am a little worried.