Depo Shot Symptoms😳😳

I got the depo shot about a month or so ago and when it came around the time I was supposed to get my period I was late 3 or 4 days but now that I got it, it's been 12 DAYS!!!😳I usually get it for 6, 7, maybe 8 days. Is this normal? Also help😭I've had my period for 12 days straight I wanna die!