Never ask a woman if she's pregnant. Never, ever, ever.
I have followed that rule like a religion. As far as I'm concerned, I don't see anything unless she says I do. I've had students come in with their girlfriend/wife that looked seconds away from giving birth. I said nothing.
Here's one I didn't see coming.
Ms. K is a client. I show up at her house on time. An older woman answers the door, says my client isn't here, she's running late. She'll be here shortly. I notice she looks like my client and, in the interest of making small talk, I say the following:
"You must be Ms. K's mother, you look nothing alike!" Hahahaha.
She says no. She's known my client so long they're starting to look alike. Haha.
All right. Okay. Seems a little weird that she's hanging around the house watching TV while Ms. K isn't here. But okay. Listen, she's a good friend. Maybe she's house-sitting. Maybe she's taking care of an invalid cat. Maybe she's living there...
New rule: Never ask someone if they're the mother. Or partner.
Never, ever, ever.