A couple weeks ago my partner and I had some pretty rough arguments for 3 days in a row. The worst part was he had been out of town working for a month and I was so missing him. Lots of miscommunication, lots of hurt feelings, lots of super intensely emotional reactions from me, and a lack of patience from him. Honestly, I think sometimes the reality and stress of woah! baby coming, money, life, work, etc. occasionally just hits a head. It's our first. Just like we experience some crazy emotional changes during pregnancy, I think men do too.
I will say that although I was feeling so upset and hurt, and for awhile was like "I'm not apologizing! He's wrong" - a good talk with my best friend helped me realize it was only making me feel worse. She suggested I try and have tenderness and love in my communication, even when it was hard, even when I DON'T feel like I want to. It's made a big difference. It's not always easy. Sometimes I want to just lose it and yell and be upset... but then I realize that all that intense emotion is just not good for me and baby right now.
When I first got pregnant a few friends said, "oh, we had our worst fights ever while pregnant" and I thought that was so odd... now I get it. Ramped up hormones, stress, the unknown.
Big deep breaths! It will pass! Sending love and patience. I hope it gets better for you