Answer:
You can always tell by looking at the Sclera: the white of your eye if it is white then there might not be a problem but if it is a yellow ranging from the color of the sun or mustard yellow then go to a doctor and see what the issue is. Or try a 6 month doctor's apointment schedule where you can get a check up every six months.
I hoped this helps and there is nothing wrong with your Kidneys.