Birth control & your period. :c

Blah,I'm on birth control and i'm on the white pills (which means your supposed to start that week) i'm supposed to start my period this week, but it's already thursday and i haven't started, me and my boyfriend had sex once last week, and once the week before. Could i be pregnant.? :/Birth control %26amp; your period. :c
Since when are you on the ';white pill';? For me, I started it on sundays and I ofter started my period on thursdays or fridays. Birth control %26amp; your period. :c
Yes it's possible if you didn't use a back up method. But there have been Several times that I didn't start until the last days of the white pills, take a hpc