If i was you, i would definitely not ask her again for awhile, women (most women, i certainly have not completely figured out any of em lol) would not like people hittin on them and trying to be more than friends when they are going through something as hard as that. Who would want someone who would do that, usually they are just doing it to spite the other person if they do it when they are going through hardships. You would end up getting hurt. I would try looking for someone new, but stay close with this girl. You never know. And like that one guy said, your pretty much the dad, the other guy is just the biological father. Tell her you wanna help her take care of her kid but dont ask her out again just yet.