In the episode, Rachel Berry (Lea Michele) and Finn Hudson (Cory Monteith) discover that Quinn Fabray (Dianna Agron) is pregnant. Rachel is initially excited about the prospect of becoming a mother, but Finn is less enthusiastic. Quinn decides to keep the baby and Finn eventually comes around to the idea.
Meanwhile, Kurt Hummel (Chris Colfer) and Blaine Anderson (Darren Criss) continue to date long-distance, and Kurt decides to visit Blaine at Dalton Academy. Kurt struggles to fit in at Dalton, but he eventually finds acceptance.
The episode also features the songs "Teenage Dream" by Katy Perry, "Baby, It's Cold Outside" by Frank Loesser, and "Santa Claus Is Coming to Town" by J. Fred Coots and Haven Gillespie.
"Preggers" was watched by 11.30 million viewers and received generally positive reviews from critics. The episode was praised for its humor, music, and performances.