"I am 18 and I have been using the shot for 8 months. If you do not want to get pregnant, this IS the shot for you! I had a period with the first injection but ever since then I haven&#039;t and I love that. It is great because it isn&#039;t that painful when receiving the shot, and it is awesome not worrying about it for 3 months. The problems I have with the Depo shot is weight gain. I am 5&#039;10 and was 126 pounds, so I thought I wouldn&#039;t gain weight, and I was very wrong. I now weight 150! I also am very moody and sometimes feel depressed. Next month I will be changing to the patch because early aged osteoporosis runs in my family."