Could Yellow Coloured Stools Be Normal On Withdrawal Of Norco?

Ok, been off norco for about two weeks and my stool is a mustard yellow. Is that pretty common and will it go back to normal when I go back on meds? My condition requires me to see a pain specialist, but I missed my appointment due to my mother passing in the same week. I had to wait until tomorrow to see my doctor, but I wanted to know if it was a serious condition.