Ok. I Was On The Depo Shot I Had It

Ok. I was on the depo shot I had it once than I had to change doctors cause of my medical stuff well it was a good month after my depo expired and I had unprotected sex well I got my depo not to long ago maybe a month or a little over but lately I've been feeling tired and I'm constipated Hungary and gained some weight could there be a possibility that I'm pregnant