Since you did not have your depo shot yet, you are no longer protected.The bleeding could be either a breakthrough or a menstrual cycle, because return of fertility
takes longer time after the last injection; so pregnancy
is a remote possibility though not totally impossible. You should see your gynecologist for an evaluation of your hormonal
status and if you are breast feeding, take extra care regarding the future medication. You may also exclude pregnancy even if it is a remote possibility. Take care.