BC question HELP

Gabriella

Okay so I have been on birth control for over 2 years and I was inconsistent in taking it for a while. But now for the past like 8 months I’ve been keeping up and not missing a pill. But my period still comes 2-3 days later than the package says I should be getting my period. The pack says I should get my period on Monday, but it’s Tuesday and not getting the feelings that I’m going to get it tomorrow.... what does this mean?!?!?!