Pregnancy can be a very vulernable time for women - our bodies are being taken over, everything is changing around us, life will never be the same, etc.
So, yes I think what you are feeling is very normal. Myself, I was quite sensitive about some things when I was pregnant, especially about the time my husband spent with me.
I agree that you should talk to your husband about how you are feeling, not just so he can understand you, but also so he can know that it's because of your pregnancy hormones and it is totally normal. I think a lot of men don't have a lot of knowledge about pregnancy, particularly the emotional aspects.