Here's a sketch I wrote recently.

INT. AIRPLANE GATE WAITING AREA
A HUSBAND & WIFE are seated in a waiting area, next to a MALE COUPLE with a baby. The Wife notices the baby and whispers to her husband.
WIFE
Ooh, look at that little sweet pea!
HUSBAND
With any luck, we’ll have our own baby soon!
WIFE
(whispers)
You know, I’m ovulating right now!
HUSBAND
Really? Should we go try?
(He indicates to the bathroom.)