Monica and Chandler’s struggle to conceive became a defining emotional arc in Friends Season 10, and it also created a real-world continuity challenge for the writers. When Courteney Cox became pregnant during the show’s final season, the storyline could not be adjusted to reflect it, because the characters had already been established as unable to conceive naturally. As a result, the show leaned fully into the adoption narrative, keeping the fictional logic intact while allowing the story to re