Jennifer Garner has humorously shut down speculation that she is pregnant after a fan asked if she is expecting a fourth child.On Thursday, the 13 Going on 30 actress shared a video of her family’s farm in Oklahoma to Instagram, where she introduced her followers to the cows that live there.“I would like to introduce you to the farm’s pets,” Garner, dressed in denim overalls, says in the video.After sharing the video, one of Garner’s followers questioned in the comments section whether the