I had bloody discharge during my mamo. I have been having greenish discharge before and wish I knew better to advocate for myself as at the time my primary sent me twice to breast surgeon which shrugged it off. I do have dense breast tissues. Anyways, after my bloody discharge, I had MRI/biopsy and ended up with stage II breast cancer. Hope this is not the case for you but if it is, take a deep breath and know you can get through it. Wish you the best.