I did a side delt injection Saturday night and I have only used this site maybe once or twice before. (Usually go for glutes and quads. Anyway the pip was pretty bad and I admit was a little shaky during the injection. Yesterday morning my shoulder hurt so bad I had trouble lifting my arm due to my shoulder hurting so much. The site is red. I watched a video from Dave Crossland explaining that this can happen when passing through a vein and blood pools in the surrounding area. He said to stick a needle in and aspirate, if blood comes out your good, if puss comes out to to a doctor. The swelling has gone down slightly but the red area has increased. I pinned the spot and aspirated and it was all blood no puss. Maybe I'm being paranoid but wanted to ask you guys if I'm good to go, or should I see a doctor? Thanks guys.