Hi, Your period will usually occur during the period you take the non-active pills or have a break from taking your pills. The break lasts for 7 days and your period will occur any time during the 7 days.
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To my knowledge the last week of birth control pills are placebos. That means they are simply sugar pills that help keep you in a routine. I think the lack of regular birth control pills during that last week cause you to start your period because you stop the hormones associated with those pills. Of course, I haven't taken them for over 10 years and the new types may be different.
Break through bleeding is quite common in the first few months, you should continue taking the pills in the packet - after they are gone begin a new packet.
in between 2001 and 2009
I would start on that Sunday. I took the pill for years and started the new pack 2-3 days after my period started. It is just important that you start to take them again otherwise they don't work.
Progesterone doesn't start your period, it's actually the drop in progesterone that starts your period. Progesterone caused the uterus lining to build up, if pregnancy doesn't occur the progesterone level drops causing the uterine lining to break down - menstruation.