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The Fosters Sneak Peek: Stef and Lena Suspect [Spoiler] Is Preggers

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Who might have a bun in the oven on The Fosters?

That’s what concerned mamas Stef and Lena are wondering after they find a pregnancy test box in the trash in Monday’s episode (ABC Family, 8/7). Their suspicions immediately turn to their MIA daughter in TVLine’s exclusive video — but it’s not the one you think it is!

While Mariana is the one who recently lost her virginity — unbeknownst to her moms — Lena and Stef think the fact that Callie’s not answering her phone (and has even turned it off, gasp!) means she’s hiding something from them.

Press PLAY to watch the preview, then hit the comments with your thoughts on who is or isn’t preggers. And will TV characters ever learn not to leave their pregnancy tests in the home trash bin?