Depo Shot and Irregular Period

Jadica
Hey so I took my first depo shot around October 20th. I was told it last 3 months and After it expires it would take at least another 3 months to get pregnant. My last period was dec 21-27. I was due for my next period 4 days ago. And I was due for my last depo in December. I have been having unprotected sex. Should I be worried?