Never lived with a pregnant woman, alas. Some pointers I got from friends:

- The correct answer to "Did you feel the baby kick?" at 2AM is always, "I certainly did!"

- The answer to variations on "Am I fat?" is always "You are the most beautiful woman in the world right now!"

- If it doesn't involve a plane ticket or armed robbery, just go get the damn whatever-it-is she has a craving for.