Jay,
I'm glad for you that it works out this way, though I feel for the girl as well and the situation she is in now.
I can see her wanting financial help with the costs for the test, but I don't see any reason why you should participate in the costs of dealing with a pregnancy that doesn't involve you. She should refer to the other guy she has been with; he's the one who needs to step up and take responsibility.
I like Ste's "fly on the wall" comment. Wow! Imagine the fireworks in THAT house tonight. But like I said, I feel for the girl and her situation. I hope the father stands by her.
Much love,
Larry