everytime i inject in my left glute.i always draw back to check if i hit a vein and i get no blood. but then when i pull the needle after im done injecting.blood begins to drip down.is that normal to happen or did i hit a vein or something..just wanna make sureee..because i dont wanna be doing it wrong.(i use 22.5 gauge 1.5 inch needle)..so is that okay?![]()