11/30/2012 08:15 am ET Updated Nov 30, 2012

'Grey's Anatomy' Shocker: Meredith's Pregnant! (VIDEO)

It was a big surprise for Derek and fans of "Grey's Anatomy." In a seemingly innocuous moment, Meredith told Derek to check out a new shirt she'd bought for Zola. When he pulled it out, the shirt read, "World's Best Big Sister."

That's right, Meredith's pregnant!

"It’s only three weeks, so I shouldn’t even be telling you," Meredith said. But she did, and the couple couldn't have been more happy. But this is a Shonda Rhimes show, and dark things can and do happen.

That's why TV Fanatic took it upon themselves to give a stern warning to the showrunner, writing, "Don’t do anything to ruin it for these two. They can not handle another miscarriage or something devastating with this pregnancy. They deserve this."

Keep up with all the twists and turns of "Grey's Anatomy," Thursdays at 9 p.m. ET on ABC.

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