Feeling irritated

Anyone else feel like they are irritated by everything? I have bren really struggling not being irritated/arguing with my fiance. He has been there for more then anyone especially with me being pregnant. Everytime, he tries to talk about something and give his opinion i get irritated and just try to argue about everything. Its not that i want to I just can't control it. I am 36 weeks and was just told shes only 5lb 2oz and in the 7.5 percentile and they want her born by 38/39 weeks. So I am just wondering if its from stress of knowing baby will be here soon.I feel bad because i feel like he may not feel that supporth/validation from me sometimes. How does anyone else handle that?