hey guys... just doing one of my routine shots... i aspirated the first time and got blood... switched needles tried a second time and it wouldn't push... so i switched legs and did it a third time.... i was pretty shakey being that it made me so nervous... anyways... I aspirated but when I pulled out and pushed the stopper a little bit of blood came out and some swirled down into the syringe.... ??? If it went into a vein how long would it be before I knew??? and what are the sides of it?