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If you are taking birthcontrol
pills from 1st day of starting of your menses then the contraceptive
effect starts in 7 days in most females so if you want to have unprotected sex you can have after 7 days if you take the pills regularly.As for the period like bleeding you have is due to postinor 2
;so from next cycle you just keep on taking regularly the birthcontrol pill & no need to take postinor 2 with that or it will again cause withdrawal bleeding.