Can birth control pill make you start your period 11 days early?

Answer 1

If you're using hormonal Birth Control pills then you no longer menstruate.

The pill works by suppressing your menstrual cycles so you no longer ovulate, and thus you no longer menstruate. The bleeding women experience while on the pill is withdrawal bleeding caused by the drop in hormones when you go from your active to inactive pills - if you start taking your placebo pills 11 days before you would have normally started your period then this will explain earlier bleeding. If you are new to taking the pill it is also completely normal to experience irregular bleeding for the first three months.