Pad, the key is something she said to you that you posted a few pages back : "She says she hates to be alone"
So the father of the baby dumped her, she's looking for a safe harbor, and since you have feelings for her you're the obvious target.
I don't understand why she wants to have the baby, she could easily have an abortion and be done with it. You COULD take her back if you feel you can love and raise the child, but again, "she hates to be alone", so I am not sure she is looking at you as a life partner. Only you know the nuances of the situation and relationship and can decide what YOU want.