Is Pregnancy Possible Despite Taking Emergency Contraception 2-3 Hours After Unprotected Sex And Continued Birth Control Pills?

Me and my girlfriend had a sudden intercourse without any protection but I ejaculated outside her vagina and she had a emergency birth controller next morning, 2 or 3 hours after the intercourse. Is there any chance of getting pregnant? She is not having her period yet. She normally take one kind of birth controller pills for her period problem. Its been 5/6 days but she is not having her period. what to do now and what is the chance of her getting pregnant.