I have been using Intra Mus injection in the hip. Decided to try sub cu in the shoulder thinking it was less invasive. Now my shoulder is extremely sore on day 2 of this wondering what went wrong? I don't think there was any air... maybe a very small bubble... I did notice the Test Cyp was very hard to push in. I thought I was going to break the device. Its a 31 gage needle.