Why are missing BC pills during the last bit of your pack more important than if you were to miss them in the middle?

im not sure, and someone correct me if im wrong, but i believe its because towards the end you need enough hormones to last you through you placebo week. for example when i was on yaz there were 4 sugar pill days, where i took no active pills, so your body needs the hormones from the last couple of days to have enough in your system in order for you not to ovulate.

I have never heard this. Are you talking about tri-phasil pills?