Shoulder/Trap day today. Good workout. Applied to shoulders when I got home. On my left shoulder, strange thing happened. I aspirated and got suction like I should, then I saw the tiniest bit of blood creep in, so I aspirated again, still a suction like I was in the muscle. Let go after aspiration and the blood kept creeping in. One last aspiration, and nothing to indicate I was in a blood vessel so I applied anyway. That was about 15 minutes ago and I feel fine so I assume I wasn't in a blood vessel, but don't understand where the blood was coming from then. Now when I say there was a bit of blood, I mean a TINY bit. With only 20mcgs in the pin, the little red spot was just enough to be seen. I'm not really worried about it, but just curious as to what happened.