Good morning!

So i have been on and off of the depo shot sin 2013 after i had my first child. I was on depo for a year more or less before i got pregnant with my second baby. As soon as my depo shot expired i got pregnant really fast, that how my second baby happend lol anyways. Sp my dwpo shot expired on February 21st and i havent gotten my period or anything... I usally get it about a week or 2 after my shot expires.. Im supposed to get it tomorrow.. has any of this happened to anybody else?