I had a depo-provera needle given to me by my doctor. While I was away travelling the family clinic would not administer it as I didn't get it from their clinic. Due to keeping to my cycle I decided to inject it myself. I researched and aimed for my upper right buttock. I made sure the area was cleaned with alcohol and there was no air in the syringe. I think the needle went halfway into my buttock and when I pulled it out there was a little blood at the tip of the needle. Now I am worried if I didn't inject it correctly it may not be effective. Can anyone let me know the chance of the injection not working. Any advice would be appreciated. Thank you.