With a title like "Pregnant Pause," and from what we already know Rebecca is hiding from Justin, it's pretty clear what the focal point of Sunday's Brothers & Sisters will be.

It's not a matter of when he'll find out, but when.

In the first of six sneak preview clips released for the episode, she's getting more and more nervous trying to avoid telling her fiance she's pregnant before their big day:

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-1/" title="Pregnant Pause Preview #1"] [/video]

Follow the jump for five more Brothers & Sisters sneak previews, in which Justin's siblings discuss the pregnancy, a secret that's bound to get out sooner rather than later.

Also, there's the small, hilariously awkward issue of Nora's new man ...

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-2/" title="Pregnant Pause Preview #2"] [/video]

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-3/" title="Pregnant Pause Preview #3"] [/video]

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-4/" title="Pregnant Pause Preview #4"] [/video]

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-5/" title="Pregnant Pause Preview #5"] [/video]

[video url="http://www.tvfanatic.com/videos/pregnant-pause-preview-6/" title="Pregnant Pause Preview #6"] [/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.