Well, if you were a pro-choice person and you didn't have a problem with the ECP, you could have went that route. You have to take it within 24-48 hours though I believe, and then another pill a little bit after that. The earlier taken the more effective. Its not an abortion pill either, it simply prevents the egg from becoming implanted in the Uterus like a normal bc pill. But its a little late for that.

Tell her to go to a doctor and get checked out so you can have more time to figure things out if she actually does turn up pregnant.