No, I had never had a colonoscopy and CRC does not run in my family. (CRC is Colo Rectal Cancer. Colon cancer and Rectal cancer are treated differently. Anal cancer (Farrah Fawcett) is caused by the HPV virus and not often found in women. TOTALLY different disease. I had colon cancer)
I've never had another polyp. My only polyp was the one 2 cm that became cancerous. I'm now on the 'every 3 year' plan but was every year for a while, jumped to 2, now go to three and eventually to 5 years. That's only because I HAVE had colon cancer. MOST polyps (unless there is a genetic FAP in the family) grow slowly and can take 5 to 10 years to become cancerous. Since your Dad was 91 and his cancer had spread, he probably had colon cancer in his 60's or 70's and just didn't know. Anyone with a family member with colon cancer should be tested 10 years earlier than the approximate date of the parent/ grandparents dx.
I think you're VERY smart to be vigilant. By being tested every 5 years, if you were to develop a polyp that MIGHT become cancer, they'll remove it immediately and you'll probably never, ever have colon cancer.
Again, I feel so sure that all you have is a tiny tear that develops after an extra large or firm stool and doc will advise you to soften your stool and use something like Desitin when needed.