Notice to the general public:
If you meet a woman on the playground or in the mall or through a friend or, God forbid, while you're trying to sell her something, and that woman is a little on the pudgy side, especially around the stomach, DO NOT ASSume or even in any way indicate that you think that the woman might be pregnant, unless you see a baby's head emerging from between her legs or she's wearing a t-shirt that says "I'm having a baby" with an arrow pointing to her stomach.
If she is pregnant, it's none of your damn business, until she chooses to share it with you.
And if she's NOT pregnant, then you are guaranteed to have sent that woman home in tears to a pint of Ben & Jerry's Super Fudge Chunk while her husband--if there even is one around-- says to her "You know what you can do about that," making her want to crawl into an even deeper hole of self-hatred.
And don't even try to think that you would be "just as embarrassed, if not more so" than she whose last shred of positive self-image was destroyed because you just essentially told her that she is so impossibly fat that the only explanation for her fatness has got to be that there is a whole other person growing in there.
Besides, you never know when your comment might be the last one in a long string of similar comments she has heard at least once a freakin week from some asshole or another like you. Your seemingly innocent but really mean and stupid question or congratulations could be the final straw that sends her into a murderous rampage in which she mows down all skinny people in sight...starting with you.