which day in pack to start with?

If I started my menstrual period on a Friday, do I begin with the Friday pill in my Nora-Be pill pack, or do I begin with the Sunday pill (the very first pill in the pack?) My leaflet from Watson pharmaceutials does not indicate which pill to start with. I already started with the Friday pill, since I started my period on a Friday and have taken Friday, Saturday and Sunday's pill thus far. Are all of the pills the same dosage? Or have I completely messed up this pill pack?

Thank you!