This could be a number of things besides cancer. I would recommend consulting a GI Specialist about this.
Hi momofeight, you are at an age where a colonoscopy might be a good idea, if I'm not mistaken the baseline is usually age 50 and most people get them in their 50's. With the history of colon cancer it might be a good idea. Polyps can cause bleeding too, alot of things can so I would make a dr appt and discuss it with him/her. I wouldn't worry yet, I'd wait and see what they said and if you have the test, the results.