I started my first pack of BC (in over a year) on the 5th day of my period. After two days, my doctor advised me to stop because of the risks associated with my migraine disorder. Therefore, I had taken two pills of the pack.. then stopped. It is now 3 days later, I am experiencing cramping (I never have cramping with periods), severe nausea and a heavy period (usually have light periods). Is this withdrawalbleeding? and if anyone knows how long this might last.. ? It's almost valentines day! 8-| oh no! and will my cycle be irregular for a few months now? :-(