Any tips on how to deal with a boyfriend with a short fuse?

I’m pregnant at the moment and don’t have time for bs...but lately he’s been getting on my last nerves more than usual..it could be me with pregnancy hormones but damn....how do I deal with him? He’s seems to be more negative about things and I’m just scared I can’t deal with it.

Currently parked outside of Starbucks with my three year old Daughter just thinking why he’s like this.....sucks 🥺