the question that should not be asked

A brief conversation between two strangers, overheard inside a public restroom:

Woman 1: 'Scuse me - you pregnant?

Woman 2: Nah. Just fat.

Woman 1: Oh. (Pause) I'm sorry. I'm so sorry.

(Interminable, awkward silence while I stand between them at the sinks, struggling to wash my hands without laughing.)

Woman 1: But really, now. You sure you ain't pregnant?

Woman 2: (Silent stink eye)