Started first cycle of testE at 500 a week. I shot into my left delt the first time, well actually my buddy did. Anyways, alcohol swabbed injection area, as well as vile, everytime pad was clean. Two seperate needles for drawing out of vile and pinning, both brand new an packaged. Anyways, shot 250 into my left delt Tuesday, at like 6pm, sore the next morning nothing series, then Friday I started noticing slight redness and swelling on my left delt. Now, I did a shot into my right delt Thursday night(plan to do Monday Wednesday shots from now on) and absolutely no redness or swelling yet, slight pain. Both shoulders feel the same, just the left is red from first pin. No fever, not noticably warmer than my right delt. Should I be worried? Maybe I was nervous during first shot and tensed up my arm? Virgin muscle and my right simply reacted better? Kinda nervous.