Hi so I've been on the depo shot for almost 4 years and around the time I was suppose to? go back to get it i didn't get it. Within the time period that I was suppose to go back to get my shot, I started potting a little and then I had sex several times (unprotected) I haven't had my period since then, I've also been feeling nauseous and its been almost a month without going back to get my shot. Could I be pregnant?