I wish I had an answer for you, but I don't. I know exactly what you're going through and feeling, and I'm sure lots of other women here to do. It's hard not to feel jealous and angry, and feeling jealous and angry feels like crap.
I can say that some days it will be no big deal, and you'll be able to ask her questions and share in the excitement, and other days it will be all you can do to hold it together until you can scream/cry alone in the bathroom/car. Don't beat yourself up for how you're feeling, and when you can, and if you need to, excuse yourself. You will be ok, and it will get easier.
I'm really sorry you're having a tough day. I hope the rest of the week gets easier.