I recently had a baby and afterward I went on the Depo shot and after being on it for nine monthes I decided to change to another form of birth control. I saw my doctor she gave me a prescription but told me not to start until the sunday after my next period. The problem is I have not had a period since a month after starting the shot. I know not having a period is part of the side affects but I have not had a dose of Depo since December 5. I have taken a pregnancy test and it came back negative, the doctor also gave me one with the same result. I was suppose to get another shot at the end of February, that is when I decided to change birth control. It has been six months since my last shot? I still want to have more children, should I be concerned? Will things go back to normal? Is it common to continue not to have a period after being on this drug?