How many months pregnant is she? Divorce was already filed, does that give you any type of protection? Also it is possible that this is not true or that the pregnancy will fail.
Mr Bond is correct that you need to protect yourself legally, as well as the rest of your family.
Take the anger and turn it into your sheild right now. Angry is not going to help you. YOU are the thing that is going to help you. This is tough but you need to back way off from her antics. There is no telling what she is going to do.
Just keep taking care of yourseld and your children right now, that is the most important thing.