Late periods

Jessica

I had a miscarriage in October and let one natural period go by before starting birth control. I'm on generic gianvi and the period window is 3 days long, Thursday-Saturday. My period just keeps getting shorter and later.. This month I haven't even gotten it and it was supposed to be ending today. That happened last month, too. My periods have also shortened to approximately 48 hours of moderate/light-light bleeding.

Is this normal?