I did something stupid, need help

So my (now ex) girlfriend broke up with me today because she found a conversation where I had phone sex. Not anyone I knew, I just paid like 10 bucks for it online. Not that it matters, but she has depression problems and goes for a week at a time sometimes without wanting to even look at me, and recently it was particularly hard on me and I felt lonely. Not justifying what happened because I betrayed her trust, but it is what it is. I feel awful about it and there's nothing I can do to fix it, but the thing is she's pregnant with my baby. If someone has some magic key to fixing everything then That'd be wonderful, knowing that won't happen, I need advice on how to approach the situation. I still want to be able to go to the doctors appointments and see ultrasounds and all of that stuff. This girl is everything in the world to me, but she doesn't want anything to do with me anymore. That kills me inside but I want to know what to do about being around for all of the baby things.

EDIT: thank for the help guys. I tried what I could with the little she'd talk to me. Unfortuanately she's made it clear to me that if I ever want anything to do with the baby it will be through court. She also said she's considering getting an abortion just to spite me. I pray she doesn't go through with that. She doesn't intend to tell me when doctors visits are, what happens at them, or even when the baby is born.