Well i'm 20 years old, ive never been Prego in my life i got on the depo back in May of 09 and than got back on it June 24th 2010, and now its September my next shot is due. I know this may sound very crazy but I want a kid, I know that there's lot of responcebiltys to go with having a kid, i have been having really sharp pains in the lower part of my somatch, it lasted for about a min or so, and now my back aches like crazy, My friends say it could be diffrent things like a bladder infection or kindey stones, or something But i really dont know what could be wrong with me, I know its not a Bladder infection ive had too many of those from drinking soda pop all the time... so I took a Pregancy test and it was Negative, and i have been having sex not much but I have and people have told me that The depo is'nt 100% and that you could get pregant on it, but I really dont believe that because you have to thing that your not ovulating and ur not having a period so how could that be possible? but than again Things happen but I will be 21 next year and I really want a kid i know id be a good mother I just wanna know what could be wrong so if anyone on here has had this problom or might know whats wrong please replay back Thanks :)