The pill is commonly prescribed to "regulate periods," but it can't actually do that because withdrawal bleeds from contraceptive drugs are not real menstrual cycles. 

In episode one of The Lara Briden Podcast, Dr Lara covers:

• what is a real menstrual cycle
• why there's no medical reason to bleed monthly on the pill, and 
• the difference between contraceptive drugs and real hormones. 

Links to:

• Blog post about cyclic progesterone therapy for PCOS.
• Lara's forum where you can post a comment or suggest a topic for a future episode.