Is Pregnancy Possible Despite Taking The I-pill?

Hi. greetings, I am 22 years old male.Me and my girlfriend had an intercourse on the day 8th of march,where she had her period on the day 14th of february.After the intercourse she took i-pill contraceptive within 6 hours.Now we are both worried because she is missing her period.can she get pregnant?or what should we do??