Sterling Cooper is hired by Kodak to promote their new "Wheel" slide projector.  After Betty's friend comes to her about her husband having an affair, Betty looks at her own phone records to see if Don is too.  She learns that he's been talking to her shrink and so decides to unload a lot of her suspicions on him at their next session.  Peggy get promoted to copyrighter but has to leave just after seeing her new office with pains.  At the hospital she learns that she's pregnant and is about to give birth.  Don's work on the "Wheel" causes him to give it the name "Carousel" and he uses his own family slides in his demo to Kodak.  This causes him to rethink a few things but he is too late to make it for their family trip.