Fighting while pregnant

Me and my SO have been arguing so much ever since I got pregnant. I’m 21 weeks and it’s been even worse the last week or so. I can’t even stand to look at him or be in the same room sometimes. We aren’t arguing about anything in particular, we just can’t talk without me getting irritated and angry with the stuff he says. I’m all of a sudden paranoid with every little thing hes been doing which has never happened before. Wondering where he is at all times, who he’s talking to, etc. We’ve been together 7 years and I’m worried that this won’t get better. This baby was planned and we are both very excited but stressed out at times as well. Does anyone else have a personal experience that can relate or make me feel better?