What sort of birth control is she using? As Fr_Chuck said, no form offers 100% protection, but if she has been using birth control pills, for example, and using them correctly, odds are low she will become pregnant. Add to that the fact that you didn't ejaculate decreases the odds even more.
Certainly possible, as anytime you have sex pregnancy is possible, just not probable given the situation. Easier said than done, but try not to worry. To help ease some worry in the future, consider using two forms of birth control.
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