Help. Relationship off?

My husband and I are pregnant with our first. Lately he's been in a really bad mood randomly and he doesn't even know why himself, so he says. He's been snippy and said things he's never said to me before. He never talks to me the way he does now. It's been going on for about a week. He seems so unhappy and angry randomly I have no guess as to why or what to do.

Also I've had a rough pregnancy so far and I haven't been able to do much housework or much of anything. He was worried about a symptom I was having so he told me he doesn't want to have sex until he's comfortable with it and has talked to our doctor. But the timing of it makes me question whether or not he's trying to get away from being intimate. Im just not sure how to deal with all of this.I feel horrible for being so nervous and not understanding what's going on but I thought maybe my Glow friends could shine some light on what they think is going on? :( is a pregnancy mood swing for guys? Lol