Progesterone and Bedrest

I'm on bedrest and I discovered Progesterone/Delestrogen shots are easier when lying down. I've always given myself my shots and have done so sitting in a chair, twisting to the side. Lying on my side with one knee bent put less strain on my neck and shoulder (from twisting) and it was easier to get into the muscle. In hindsight I realize that sitting makes for a plumper tush, whereas lying down with a bent leg smooths and thins the fatty layer. Is it coincidence that I didn't bleed this time? (Well, there was one small dot of blood, but there's usually a dribble.)