Anyone who comments "Wow! It MUST be twins."
People who say "Well you should really enjoy pregnancy and be grateful because so many people can't get pregnant." (Last thing you want to hear when you are on the verge of puking/having a preggo breakdown /got lectured for weight gain/etc.)
"You probably shouldn't eat/drink/lick that...because you're pregnant."
90% of those who start phrases with "Well, when I was pregnant..." and comes out sounding like "I did it better than you because..."