Relationship struggling

I'm 20 weeks pregnant with my second child to my partner of 17 years (we've been together since we were 15). We are about to move out of our home and move be to another country. It's a stressful time and I'm obviously not able to manage my emotions as well as I could if I wasn't pregnant. We are been arguing often and just can't seem to get on the same page. My partner always states I'm being unreasonable/difficult but I'm not seeing that. Sure I'm more easily upset but I'm not yelling and screaming or being nasty in any way. We had another argument last night over organising things for the move and we didn't speak all night or today. That has never happened. He is now telling me he should be the happiest in his life right now but I'm making him miserable. I'm stubborn on the fact that I'm not going to simply apologise and take all of the blame for our arguing . I'm heartbroken and don't know what to do or who to talk to. Looking for others thoughts and views.