Quoting The Inconspicuous Raccoon:" Most of the time. He felt the need to call me at 4 AM and wake me up to talk about all of our issues. ... [snip!] ... finding out you'd be a single mom? If you and your BD broke up during your pregnancy, did he decide to be there for your kid?"
Just remember that a baby not having a father around doesnt mean that the baby wont be well taken care of or loved. It'll be hard on you, but in the end, you'll get to look back and say, "I did it.". And even better, you're the one that gets to hear the first word and see the first steps all for yourself.