Season 2, Episode 10: Act of Love

Sue Ellen is knocked up! JR finds out whilst with one of his mistresses, and Sue Ellen breaks off her affair with Cliff. Everyone celebrates while drinking champagne... including the mother to be! Oh, 1970s.....

There's also a back storyline where Pam is trying to have a life and career and Bobby is all, "but it inconveniences me!!!! whine, whine, whine!". Hard eye roll at the whole thing.