Got Blood?

This morning, on the last shot of my first cycle, blood drew into the syringe when I aspirated. This is the first time that it has happened to me. No big deal, it just pissed me off that I had to jab myself again. Anyway, it got me wondering. How often does it happen to you guys? About once per cycle (lets say with a cycle that requires around 20-30 shots). More? Less?

200+ jabs, drawn blood about 3-4 times, gotten blood in the tip of the syringe(like knicking a vein on the way out)about 15 times give or take. Really hit a nerve about 4-5 times