Two for One - S7-E2
Trivia: At the end of the episode Nine Is Enough there is a scene making a joke out of Dan being in shock about Roseanne being pregnant. In that scene they show Roseanne in the future with a pregnant belly wearing a maternity dress. In the very next episode, Two for One, she is in a maternity shop trying on that very same dress.
Answer: Yes she was. When Laurie Metcalf, who played Jackie, became pregnant during the series, her pregnancy was written into the storyline; her pregnant belly is real. At the end of the episode where Jackie gives birth, there is a photo of Laurie Metcalf in the hospital just after she had her baby.
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