I agree that sis is pregnant and Ethan was planting a listening device.. how they know she is pregnant. The rat success gave them all the incentive they needed to want to hire her, thus the pitch before they knew sis was preg.
My question - for as smooth as they are, why make the mistake of saying they know the sister is preg before logically they should know. This startled Juliet, who knew that no one shuld know yet, least of all some guy from "Portland"