First of all, you did unprotected sex in safe period, just prior to commence of due period though you took pill for delaying it.
Second thing, you took unwanted 72 as additional protection within first 24 hrs. It gives more than 95% protection against unwanted pregnancy
In this case, your chance of being pregnant is almost nil. A withdrawal bleeding may occur within 7-10 days and may coincide with your due period. Next cycle may be earlier or delayed due to hormonal
, take healthy diet with iron & vitamin supplements, maintain genital hygiene and take sound sleep. Practice safe sex