Urine colour problem. Tests? or what?

So recently since few weeks i have seen that my urine is darker, its kinda yellow, orange idk if its orange maybe its deep yellow or amber. Last month i had stomach pain, for which I showed to doc and was prescribed to do usg abdomen and lft, lft was fine, attached the usg report, theres a 2.9mm gb polyp. Anyway, my problem is that dark urine, i drink adequate water, when i go to pee after drinking much water, the pee is clear, but sometimes later is becomes yellow, i am not sure if that's the normal color, attached the image. Also even when the pee color is clear i feel pain(not burning) in my urethra. Please help me. I am scared. Is this infection or something? What should I do? Repeat scans and tests? Or what?