UTI, should I be concerned?

I've had a UTI before and I think I have another one. Constant urge to pee, etc. my problem is though I went to pee one time and when I wiped a few times I noticed the toilet paper was tinted pink/brown? Should I be concerned? Urine has varied as far as dark/light. I have no idea. I feel fine but obviously not everything isn't okay
Any help/recommendations appreciated 

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