 " Secrets " is the sixth episode of the second season of the post @-@ apocalyptic horror television series The Walking Dead . It originally aired on AMC in the United States on November 20 , 2011 . In this episode , Glenn ( Steven Yeun ) tells Dale Horvath ( Jeffrey DeMunn ) that Lori Grimes ( Sarah Wayne Callies ) is pregnant and there are numerous walkers in the Greene barn . Dale confronts Hershel Greene ( Scott Wilson ) about hoarding walkers in his barn . Meanwhile , Shane Walsh ( Jon Bernthal ) attempts to teach Andrea ( Laurie Holden ) how to use weapons and Lori agonizes over the decision to terminate her pregnancy or keep the baby . 
