Getting off depo shots

Daj🫶🏽

So I gotta quick question but let me say this first.

when I was on the depo shot , 2 days or more before it was time for my shot I would start my period. Well this time my period didn’t come on before my shot and I haven’t seen it since 3 months ago.

Has anyone ever experienced this ? Has anyone gotten pregnant while taking depo shot ?

Should I be worried ?