ET's countdown to the premiere of The CW's new "90210" spin-off continues with a pregnancy scare for Brenda (Shannen Doherty) in this Web exclusive clip from the original "Beverly Hills, 90210."

With Donna (Tori Spelling) and Kelly (Jennie Garth) by her side, Brenda reviews the questionable color-coded results of a pregnancy test, then ponders if her romantic encounter with dreamy Dylan (Luke Perry) was really worth it!

Before the launch of the new series, SOAPnet will celebrate the original Aaron Spelling show with a 24-hour marathon, starting at midnight on Monday, Sept. 1 -- with ETonline giving you a sneak peek of the episodes that will air!

Then, on Tuesday, Sept. 2 at 8 p.m., the all-new "90210," starring Rob Estes, Lori Loughlin, Shenae Grimes, Tristan Wilds and Jennie Garth will premiere with a special two-hour episode on The CW when the Wilson family moves to Beverly Hills.