Possibly pregnant?

I’ve been having these symptoms for almost 2 weeks now. headaches, nausea, very tired (feels like I’ve been hit by a bus). I have to force myself to eat. I don’t want to look, touch/see food. I noticed today when I smelt food cooking I wanted to be sick. I have been cramping but no blood. I am on birth control Depo to be exact. I got my shot April 28. 5 weeks ago. I know Depo is very effective but my shot wore off 2 weeks before I was due. Any suggestions?