how do you not get pregnant on the weeks where you just take sugar pills

This is only the case if you take the 7 pills leading up to it correctly and it’s important to start your new pack on time. The 7 pills leading up to your break make it so there is enough in your system to keep ovulation from happening by suppressing it. That’s why missing pills around your break week is considered risky and professionals recommended to take no break or opt for 4 day breaks.