hi doc good morning,,, i had my menstruation april 4-6,2014. but i start taking diane 35 pills april 20,2014 the first sunday of the pack calendar...my concern is,,,does my next menstruation is the same day, is it on fist week on may? or i will have my menstruation only if i finish taking the 21 pills... then if i have my menstration on first week on may for sure the 21 pills not done taking yet,,do i have to take a new pack of dianne 35 pills on the first day of my menstruation for next month? please need some advice this is my first time taking diane 35 ...thank you,,,,