Birth Control Shot

My husband and I have a 2 year old son and want to eventually add onto our family but just arnt ready yet. We use condoms any time we have sex but I want to get back on birth control to help ease some of the worry as to "what if they fail". I am terrible at remembering pills everyday and am considering talking to my doctor about the shot. Has anyone or does anyone use this method and what do you think of it?