I NEED ADVICE

I'm 12weeks pregnant and this entire 3mnths has been miserable... Me and my SO of 2yrs can't get along for nothing in this world... It all started every since he has been living with his mother for a couple of months now she suffer from mental illness and I feel like it's rubbing off on him he's angry all the time he's to the point where we can't hold a convo with out arguing I'm so lost...😔