I just did my first 2cc pin. It was cool. Half Test Cyp and half Test Prop. I'm worried the prop will have pip, but it is what it is. I F'd up the other day and during a pin and ended up with a hugely sore quad. I started to pin in the right quad, but as I started to break the skin, it didn't feel right, so I pulled back. I was directly above a big blue vein. So it started bleeding. So, I changed to the left quad without changing the syringe. I think this allowed bacteria onto the pin. What should I have done?