What can cause you to start your menstral cycle while taking nortrel birth control (the pill)

What can cause you to start your menstral cycle while taking nort…?

http://www.chacha.com/question/what-can-cause-you-to-start-your-menstral-cycle-while-taking-nortrel-birth-control-%28the-pill%29

Nortrel doesn’t stop you from getting your period. It stops you from getting pregnant. You’ll still have your period monthly.