Has anyone ever seen little spots of blood in the part that connects the needle and syringe after injecting. My buddy swears he pulled back and there was no blood. I know he didn't inject in a blood vein because I probably won't be alive right know. But how did the blood get in the needle? I did bleed alot after he pulled out but I don't think that matters. So can anyone tell me if I might have any side affects from what happened? Any thoughts on this would be helpful.