When you'll get results, ask, if some biopsies of colonic mucosa
, other than polyps, were taken. It is possible to have any other large intestinal disease together with polyps.
In meantime, you can observe, if anything changed about the mucus discharge, you've mentioned. Mucus was maybe from polyps, but if after a weak or more, mucus will continue, than it's from small intestinal disorder, I guess.
Pain was not from polyps (as you see). Pain is probably from your stomach.