Unprotected sex before I got on depo shot.

Hey there ladiesss, I was just wondering. I've had unprotected sex before ever getting on depo shot, and I got it a week before getting my period. I was suppose to be having my period by now but I am currently 2 days late. I'm having some very very mild cramping, sore breast, very very tired and feeling and craving more then usual, things I usually don't crave. Is there a possibility I could be pregnant?