Yeh just a tiny one.... Still freaks me out though...trying to get all the bubbles out.
Don't be a pussy. You'd need to rig a vacuum cleaner up to your veins and set it on reverse for anything interesting to happen.
I purposely put an air bubble in my syringe so all my gear goes in. It keeps it from leaking out as well, even with more shallow injections in smaller bodyparts.
Also, not sure if it's the sciatic nerve that's being hit. If you hit it, you wouldn't be posting here about it. You'd be digging the the pin out of your ass at the hospital because it snapped off. Probably just the large volume of oil sitting in your muscle and paranoia.