Feeling hateful lately!

I am typically a very happy and outgoing person, but lately I have felt so pissed off at anything my love does. Especially when he talks about sex (because I have had no desires to have it) and about having more babies. I do want more children but I haven't enjoyed this pregnancy as much as everyone says you do (I know, you're all gasping for air since that's awful for anyone to say). I just want him to say "okay babe, I'll do that" or "let's get through this one before thinking about another" or "you're doing so great". Not that he doesn't encourage me but why am I so upset with him all the time?! Please tell me I'm not the only one!