Unless she tracked her ovulation using basal temperature readings daily for at least 6 months (1 year is more accurate) there's no way for her to know when she was fertile. Obviously she was fertile when you two had sex, which is why she conceived. This is why the pull out method is not even considered a form of birth control, it's considered "trying to conceive".
A woman can get pregnant any day of the month, even during her period. Unless you know by actually tracking ovulation, not using apps or guessing based on majority, you don't know when she ovulated. So congrats daddy. Next time use protection if you want to lower the risks of pregnancy, but even then pregnancy is possible.
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