Actually My Gf And I Had Sex On 18 Th

actually my gf and i had sex on 18 th and she was expecting her periods on 6 th so she took pill after 24 hrs on 19th and got her periodds very well on time...generally i have herd a delay r early period but its not in her case second period was again on time but only for 2 days and was huge third period is 1 week early ..is she pregnant as she took pill after 24 hrs...