Chances are less.
Thanks for writing to us.
Firstly, if she has regular cycles and is not in the ovulation or fertile period, intercourse even without protection is safe.
Secondly, it was protected and ejaculation did not happen, though, pre-ejaculate
is sufficient to cause conception during the fertile period without any barrier method.
Thirdly, she did take emergency contraception
and this makes her very much safe. Only, she may have some breakthrough bleed in a couple of days and her next normal period may get delayed by a week or two.
If she does not see her next period even ten days after it is due, please see a specialist for the correction of the hormonal
imbalance created by the emergency pill.
Hope your query has been clarified. Please feel free to contact for further information. I will be happy to help.