[taylalatbh.]

I can't be 100%, obviously. But even if there was any ejaculate left on your hands, after you had washed them, it would have been useless. And since you weren't inside her for that long the chances are very, very low. The only thing you (well, your girlfriend) can do is take a pregnancy test 14 days after the incident, or wait until her next period arrives.

Try not to stress.