Okay, she might be a biatch. I don't like her either, because she cheated on MC with you. I understand that you don't like her anymore since she wants to go and apologize to MC when she realized that you're actually an asshole. But you NEVER, and I say it again, NEVER kick a pregnant woman in the stomach. Especially when she's pregnant with your child.
You don't push a pregnant woman down. And even more, you just don't kick a pregnant woman, especially on her belly when she's pregnant with your baby. Even animals don't go that low. A lion doesn't eat a pregnant rabbit. A male cat doesn't even treat a pregnant female cat with ferocity, even if they used to hate each other so much.
Even narcissist wouldn't do that. Not if the woman is pregnant with his child, as the child is his own extension. He would feel that a kick to the pregnant belly of his wife as an offense to him. And this moron? Wow... He took it to a new low.