(( VaginaPagina ))

Did your doctor give you a specific reason for starting the pill on the first day of your period? Generally the reason this is recommended is because it's effective against pregnancy immediately if you start it on the first day. You can start it when you're not bleeding, in which case it will be effective against pregnancy after 7 days of taking it. For you, since you are using it for period regulation and not pregnancy protection, it shouldn't matter when you start it (though if you also intend to use it for pregnancy protection, just be aware of the seven day rule).