Carla isn't hiding her secret very well: she's pregnant once again. Even though she is showing, she hasn't mentioned her pregnancy to anyone in the bar, nor has anyone in the bar approached her on the subject. Finally she announces that she is pregnant, only delaying the announcement because she wanted to tell the father first. To everyone's surprise, Carla announces that the father is M.I.T. computer geek Marshall Lipton. After talking to Marshall, Diane figures out that Marshall isn't really the father, nor does he know that he isn't. Diane confronts Carla with her deduction, and Carla admits that indeed Marshall is not the father. Carla was feeling alone in the world and wanted someone stable to support her new baby. Diane tries to guilt Carla in admitting the truth to Marshall. If Carla does tell Marshall, he may forgo his position as father. Carla may have to look for someone else to help her with the baby unless that person or people come forward.
—Huggo