Do you think you could talk calmly with those facts? If you can, and you think it would help, then so be it.
I think, once he finds out and acknowledges that he will always be a dad etc, he has a new reason to try one last time. But...that is his decision to make.
Ask for what you want.
Mr. Bond's sugg about a short email that encourages HIM to think (then call) is a good one.
You could also see him in person...that is big (and exciting) news.
Congrats, by the way! Bad timing, but your child will love you regardless~
