What Causes Menstrual Like Bleeding After Having Unprotected Sex?

hi...
i had unprotected sex wid my gf for the first time and used the withdrawal method on 10th june at around 3 in the morning...i gave her mifepristone 200mg the next day at some 1pm...she had her usual side effects...however she said her bleeding was similar to her periods and lasted xactly 3 days...she is due 2 get her periods from 20 dis month...is der a chance dat her menses were advanced or will she again get delayed periods...if she doesnt get her usual periods do we hav 2 consult a doctor as i m confused if her periods were advanced...