Medroxyprogesterone Acetate (Provera) question

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So this is my second cycle taking it. I was supposed to take it from the 1-7 of the month but I started one day late (I took it from the 2-8). Last month I got my period on the 16th (9 days after my last pill). It was probably the worst period of my life! But this month I haven’t gotten my period yet. Today is the 20th so it’s been 12 days since I took the last pill. Is that normal? Should I be worried?