Just like January said, my doctor has told me that they can usually tell right away, just by sight, whether a polyp looks bad or not. I am sure he would have told you if he feared the polyp was worth worrying about.
Of course, the doctor can't tell you definitively the day of the exam that the polyp is okay; that's why they send the sample out for review by pathology, but they know with probably 90% certainty and would have given you a little warning if it looked bad.
I have a long history of inflammatory bowel disease and hold my breath after each colonoscopy for the 7-10 days it takes to get back the biopsy results. I just went through this about 5 weeks ago, and when the call came in from the nurse that all was okay, I did the happy dance.
So, get on your dancing shoes. I sure you'll be doing the happy dance in another week.