1. You NEVER...EVER ask a woman if she's pregnant. If she brings it up in conversation, feel free to inquire, but NEVER EVER assume.
2. Do not show the mother-to-be any pictures of her being pregnant unless she asks for it. She's usually okay with pictures being taken, but do not share them with others. Save them to show after the pregnancy, and ONLY in the order they were taken. You show her a picture of her body several days before birth and it doesn't matter if she's bedridden or not...your going to get kicked in the nutz.
Thanks to Yuki and Edh for bringing them up this morning.