Serena was actually buying the test for Blair, whose period is late. While the test ultimately comes back negative, the fallout is permanent.
This episode marks the transition of Chuck and Nate's friendship from best friends to bitter rivals and Jenny's official entry into the "popular" group. [S1E13] The Thin Line Between Chuck and Nate
Distraught by the pregnancy rumors, Dan blurts out his love for Serena in a panic. He later tries to redo the moment with a romantic picnic, but it is derailed by a Gossip Girl blast. The Betrayal: Chuck vs. Blair vs. Nate Serena was actually buying the test for Blair,
After Blair rejects Chuck and his "games," Chuck retaliates by leaking to Gossip Girl that Blair slept with two different guys in one week. Distraught by the pregnancy rumors, Dan blurts out
In (Season 1, Episode 13), the Upper East Side is rocked by a pregnancy scandal that quickly shifts from Serena to Blair, leading to the ultimate collapse of Blair’s social standing and the end of her relationship with Nate. The Scandal: The Pregnancy Scare
Nate breaks up with Blair, telling her he wants nothing to do with her. Blair is effectively "dethroned" as Queen Bee at school. Episode Highlights