Just an echo- if the pills aren't taken as they are meant to be it is possible to get pregnant. I have a nephew because my sister missed the first active pill after her period and an adoptive nephew because my cousin took a 3 day course of antibiotics while on the pill. Another one of my friends gave birth to twins because she would miss a couple days then take several at once and did it so often it messed up her body into dropping multiple eggs.
Anytime you miss a pill, use back up just in case. And only ever use a pill as they're intended.
Whenever missing a birth control pill there is a slight possibility of pregnancy, which is why you are supposed to take the pill as soon as you remember or double up on your next pill.
Best wishes!
I would say that anytime any of the pills (except the inactive ones) is missed the % of risk increases.
Keep us posted ..
C~