Your situation is so much more complicated because I understood that you are no longer involved with the woman who carries your(?) child. Should become pregnant, I would be happy, no matter the father. Freaked-out, but happy. My partners of course might feel differently, but it's something I usually bring up in the rather early stages of the relationship - that even though the likelihood is very low, if I do conceive, I am going to keep the baby.
I am sorry I have no words of advice or great insight for you