Well, I don't know where to start here. I was recently pregnant so I do understand the "hormones". I truly loved (almost) every minute of being pregnant and I miss it so much. My temper was a little shorter, I was a little more sensitive and I was more easily annoyed. I think those are a given. I believe that some women have stronger effects and some have very little. I was on the lucky side most of the time. I do remember, though, that there were times that my DH annoyed the ____@____.com out of me. I would see him sitting there doing something and I would get this rush of total annoyance. I kept my mouth shut and walked away, knowing it was just my hormones acting out. Other times I would want to badly to pick a fight...for no reason. Again, I would just bite my tounge and walk away.
Personally, my husband wasn't insensitive with regard to my pregnancy. In fact, I know he kept his mouth shut more than once and looked the other way when I was overly-annoyed (usually with one of our dogs). But, in all honesty he's the type that really thinks about what he says before he says it. He's taught me how to do that and it's something that we have worked into our marraige at this point. Trust me, he has his faults (as we all do), but I never had to deal with that with him.
That being said, some men are just blockheads when it comes to their mouths. They will make comments about PMS, pregnancy, post-partum that are just idiotic.
So, just take it in stride (as much as possible) and realize that his stupid comments probably stem from the fact that deep-down he's jealous that HE can't grow a baby and experience the most wonderful gift.
Take care and congrats on the pregnancy.