Anyone ever had a kidney infection?

Well, I'm a bit concerned because I'm having some lower back pain, sort of whenever I bed on my lower right side (in my back) though I have no other symptoms of an infection. I just took an anti-inflammatory in case of an infection, I have my routine physical on Friday. I also have my period right now, but... show more Well, I'm a bit concerned because I'm having some lower back pain, sort of whenever I bed on my lower right side (in my back) though I have no other symptoms of an infection. I just took an anti-inflammatory in case of an infection, I have my routine physical on Friday. I also have my period right now, but this feels almost like muscle pain but I don't know what I would have done? Just wondering what a kidney infection feels like?
Update: It's so slight it's not really noticeable, I can't go to the ER. It doesn't feel like I slept wrong at all. it's not sharp pain it's pretty dull. I doubt my kidneys will fail, if it's worse tomorrow I'll go then.
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