I have irregular period. And it's my first time to use BC PIll since I have active sex life now. I already bought a first pack last month and the instruction was to take it when my first day of period came. But it's more than a month now since my last period and i want to use the pill already. Is it ok to start takng it already? or should i be patient to wait for my period to come which is i'm not sure how long it will take.