I just recently got over a UTI. I didn't take any antibiotics, but I drank plenty of water and took cranberry tablets. I also took some azo pain reliever for two days. I haven't had any pain when urinating, or any urgency in a couple of days as well. But yesterday I noticed a tight feeling on my left side, under my ribs. Now it's a dull ache, that I only notice when moving around, or if there is pressure against it. Should I be worried? Could it be a kidney infection, even if I am not having any trouble urinating?