Season 1 - Epsiode 13

13 - A Thin Line Between Nate and Chuck
Pregnancy reported on Gossip Girl. Gossip Girl takes pleasure in reporting that Serena van der Woodsen was spotted buying pregnancy tests. Of course, on the Upper East Side, the truth is often even juicier and more scandalous than the gossip, and this time is no exception. While Blair believes she is pregnant and that her life is over, Nate is more than furious at Chuck for sleeping with his girlfriend. Between the confusion, Blair wonders who the baby's father is creating confusion, anger, and most importantly, drama.