Me & my girlfriend have a unprotected sex on 21st August as I think it is a safe period because his last period is on 25th July but she is afraid so i bring him a i-pill but she will not take it for 3 days as she is waiting for regular period after 72 hours she take i-pill between 74 to 75 hours today is 1st September she still not having her period now I am also scared, Is she pregnant? kindly help now what we have to do.