I had a colonoscopy and there was nothing found but I stil have bright red blood after going the toilet. Next doctor appointment in march.?

Fissures. Lad you had the colonoscopy. Now that you know cancer is not an issue, the remaining causes are typically "self-limited." most common cause is small tears caused by splitting when you move your bowels. Try inserting a glycerine suppository 5 -10 min before each bm to help lubricate. May clear the problem.
Hemorrhoids likely. Bright ted is coming from the last few inches of your rectum. Get checked sooner. Plenty of treatments.