I'm looking at the spot I shot in my delt. Seems there is a vein there close to the skin that I missed. What I think happend is I injected went through the vien or nicked it, aspirated and left the needle in (oil went into the muscle since it's pretty sore now) and when I pulled out it just bled. It literaly only bled for 5 seconds but quite a bit of blood came out. Thanks for the advice guys.