Mostly, I've been a lot grumpier than usual. I have been avoiding "the world" for the majority of my pregnancy. A time will come when your pants won't fit anymore. It sucks, but don't be tempted to force yourself into tight jeans. Babies can't tell time, so "morning sickness" doesn't always necessarily happen in the morning. Your body will tell you what your baby does and doesn't want you to eat early on. Listen to it.
Oh, and make sure you have people who will get up in the middle of the night and deliver whatever you're craving. Gus tried to do it all by himself, but it was too big of a job for him.