Exes and drama

I have an ex husband, and we have both moved on. Our new relationships are wonderful and we all get along and communicate great for the children. I know that isn't the 'norm' but we really have a great thing. Well my current SO has one child with his ex. She has always been annoying but somehow she found out we are expecting and she has lost her damn mind! She is constantly Calling and texting and being vulgar to my SO attacking me verbally to him and saying that 'her son' isn't allowed to be around me or at my house. I know her words and opinions don't matter, and I could care less what she has to say. The problem is that I'm so tired of all this drama. All day, everyday. My being pregnant has nothing to do with her at all. It changes nothing for any of our children, no visitation, no money changes, nothing. I was just hoping someone  would have some advice. There has to be something that can help. She never talks to me directly but I hear her calls and see her texts frequently. He has tried to talk to her about it, and he obviously can't block her because their son is shared between them. It's just so frustrating and really starting to drag me down! Thanks for any advice in advance!!