<Table> <Tr> <Td> ← Previous "School Lies" </Td> <Td> Next → "The Blair Bitch Project" </Td> </Tr> </Table> <Tr> <Td> ← Previous "School Lies" </Td> <Td> Next → "The Blair Bitch Project" </Td> </Tr> <P> "The Thin Line Between Chuck and Nate" is the 13th episode of the CW television series, Gossip Girl . The episode was written by Felicia D. Henderson and directed by Norman Buckley . It originally aired on Wednesday, January 9, 2008 on the CW . </P> <P> After Gossip Girl posts a picture of Serena looking at pregnancy tests, everyone thinks that she must be pregnant . Jenny, Dan, and Rufus see the news online, and Dan worries about what's the right thing to say . After hearing about the Gossip Girl blast while with Eric, Serena runs into a frazzled Dan who blurts out that he loves her . Serena tells him that she's not pregnant, and goes to find Blair . It's revealed that Serena bought the test for her because Blair mentioned that her period was late . Blair refuses to take the test since everything is going so well in her life . Including her reinforced relationship with Nate . Dan tells Rufus about what happened between him and Serena, and he says that it's a good thing it was just a scare, because they need to take some time and slow down . Jenny tells Dan that if he really does love Serena, he should tell her again in a more personal way . </P>

When does nathan find out about chuck and blair