Seasonale BCP

I recently heard about Seasonale BCP that supposedly doesn't change the lining of a woman's uterus. I asked my OB's nurse about it and go the impression that it works no differently than the current BC pills, only difference is that you have a period 4x a year. I was wondering if you know anything about the pill.

Seasonale is a "birth control" pill that contains both estrogen and progestin. It functions no differently than other pills except that there are no placebo pills to be taken during a thirty-day cycle, so instead the pill is taken for 84 days with a placebo pill for another seven days in order to allow a new cycle. That is how it happens to limit menstrual cycles to 3-4 per year. The Seasonale regimen only allows for an increasingly deciduous lining in the uterus since the accumulation of old lining is only sloughed off once every few months.