It is possible. The mechanics for fertilization are beyond extensive in this game. In addition of pre-cum fertilization, you can also manage to get residual sperm into you by accident from stained clothes, hours after the act. The chances aren't high, but it is still possible. Here's a quick test I just did for Boris on a little tool I made to test the fertility cycle mechanics:
We can see that right after pulling out we've received about 8% of his usual potency into our Sveta, which could end up fertilizing her if it was proper time of the month and with some luck, as it would be about 0.3% chance per hour.
Just keep in mind that anyone who might get you pregnant this way almost certainly does not have event text written for the possible pregnancy, as the odds of it happening are so low it is a very low priority to design.
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