You're the center of attention
Once you start to show, it seems as if the whole world is suddenly in love with you. You get a seat on the subway, get to cut in line at the bathroom, and even get special parking at Babies "R" Us. People carry things for you, hold doors, bring you chairs to prop your feet, and offer you glasses of water. There are days when you might not be in the mood for such fawning (and all the advice), but by and large, it's a nice break from reality.