Keep in mind this isn't just about the two of you anymore. There's someone else involved that needs your love and support.

Did you know that a woman being stressed during her pregnancy can weaken the baby's immune system?

I would start couples counseling, if for no other reason, that to show you're committed. Second, get involved with the pregnancy and the life the three of you will have. Just don't be too pushy right now. She's gone into protection mode and she has every right to be in that place right now. Be kind, gentle, reassuring, and supportive. Wishing all three of you the best.