Dark Urine - Day 3 of WF

Hello everyone..hope all is well. I'm currently on day 3 of my WF and I've noticed the color of my urine is quite darker than usual, almost that of an orange color. On my previous fasts, it's been lighter and not really this dark from what I can remember. I'm not too worried but at the same time, I'd like some insight on this. I have been drinking water according to thirst only and that has been just about 8-10 oz per day. I don't like to chug water while fasting because I don't want to overload my kidneys and lose too much electrolytes. I've always did it this way while fasting. Can someone please shed some light on why this is happening and if it's normal? Thank you and have a blessed day !