Junior, at least you recognise that it is a problem. Obviously only you can change your own behaviour and the same goes for your partner. But be very clear about this, shouting, screaming and name calling etc would fall under 'neglect' in the eyes of many social workers so it has to stop.
And that's it in a way. You simply say' this stops right now'. You either discuss calmly and rationally just what is causing all this conflict and work on negotiating the terms of your relationship or, if that cannot be done, I'm afraid it could be the end of the relationship. Your baby comes first. Domestic Abuse is very, very, very damaging to even babies in utero. They become worried babies and can display all kinds of sad, difficult behaviour. They also grow up thinking it's the normal way to behave.
If you feel that dealing with this alone is too difficult do discuss with your health visitor, there are counsellors,support workers and other people who can help based around children's centres etc. they will not judge you, rather admire you for seeking help.
Having a new baby can be very challenging, it gets easier. Having said that we don't know if this is a new thing or you simply have a crap relationship. Have a good hard think and make some big changes. For you but also for your little baby.