No, Caroline was not pregnant in Season 6 of The Vampire Diaries.
While the show explored various romantic relationships and personal journeys for Caroline, her pregnancy storyline didn't occur until Season 8. In Season 6, Caroline was still adjusting to her newfound vampire life and navigating her relationships with Stefan and her friends.
The show's writers focused on other plotlines during this season, such as the rise of the Travelers and the ongoing conflict between the Mystic Falls residents and supernatural beings.
While Caroline experienced emotional and physical changes as a vampire, her pregnancy was not a part of the narrative in Season 6.
