Her period was supposed to come on 12/03/2014 and we had sex on 8/03/2014 th .. she took I pill within 7 hours after sex and now her period is delaying ... it's been already 8 days after taking I pill .. normally she has a cycle of 28 days and now it's days 8 days delayed still no period. what can be the reason ? please help ? should i take it as a sign of pregnancy ?