Brandy, just as a piece of info, you can have the depot shot in your arm, I had it in alternating arms every three months for at least 10 years and it worked perfectly well. I used to get crippeling backpain for 3 days after the shot, but was fine with the arm.
You will still feel a bit sore around the injection site and you tend to get a lump for a couple of days, but at least you don't have to sit on it.
If you have the info leaflet it should state that you can get the injection in the upper arm.
No bruise, sorry Lex!