Does Metformin Or Wellbutrin Cause Loose Greenish Stools?

Hi my doctor had me start Metformin and Wellbutrin to try and help me lose weight and hopefully help with my PCOS, since starting the medicine I have had watery diarrhea and a couple days ago it became green in color, over the weekend it went to loose and was not green, but today it is back to watery green, is this from the medicine, because none of this was happening until I started the medicine?