Unborn baby fights

Imogen • My baby girl due Sept 3rd 🎀
Ok so I'm 3 months pregnant. My partner has left me and I'm struggling. All my friends are convinced he's mentally abusive but obviously I just want things to work. 
Basically I announced on Facebook a very basic picture and said I was excited and my parents were. And I said "baby love due sept 2016" 
This is my surname and not his. 
A few of his family members are on there and have all kicked off. And now my ex is saying the baby will have his surname (I was at the time neither for or against this ) and he's going to court to take the baby off me 
I'm going out of my mind to be honest. I've gone through enough lately and this baby already is my world and now the man id planned to spend my life with is trying to take that off me 😥