Uy, okay lang, DMPA is super reliable, especially kung consistent ka ng one year na! But since you're worried, best to see your doctor or OB soon lang para ma-ease your mind and they can check if kailangan ng anything; walang masama sa peace of mind, diba? A few of us moms have been there with the worry, and ang OB talaga ang makakasagot ng tama sa specifics ng situation mo. Sending you hugs, you're not alone in this!