How to make a pregnant woman feel like shit:
Overhear her tell someone else that she still has "just under 3 months to go" and butt your ugly ass head into the conversation with: "You still have 3 MONTHS?! Oh, honey.. I'm sorry!" while staring at her belly.
How to make a pregnant woman feel wonderful:
Be a random bell hop at the Marriot where she is meeting her friend for dinner at the hot new pool side lounge and tell her that her dress is pretty and then give her a rose.