Had polyp removed during colonoscopy. How long until I find out if its cancer?

Had the procedure on Wed. and my Dr. removed a polyp. She sent it to be biopsied... How long does that take and when will I know if it is cancerous? I have an appt. to see my Dr. Monday, but if it turns out to be cancer, would I know sooner than Monday? I wasn't real worried until today... But now I am getting more and more worried, especially since I've had some very severe epi-gastric attacks lately, and we're trying to figure out why I'm sick all the time. Anyone have experience with this??