After I drew blood when aspirating in my left delt, I immediately pulled the needle out. I changed needles and there seemed to be no blood in the barrel. I then tried my right delt *alcohol swabbed the area) and aspirated and no blood and therefore injected in slowly. After I was done there was some blood in the tip of the barrel. IS this OK? My left delt is more sore than my right delt and it has only been 30 minutes post injections.