She's pregnant and I'm the father,
so where do I go from here?

That's a good question, and just by asking it, you're on the right track.  Standing beside this woman and her child is where you belong.  After all, you're the father of the child.

You helped bring the mother and baby to this moment. So, it's only right that you should ask questions and help make decisions.

You're also right in not suspecting for a moment that this will all go away and be forgotten.  It can never be that way, you know that from this day forward, you have created life.  Now this life is in your hands.