SNEAK PEEK: Leah's Upsetting Doctor Visit on Teen Mom 2

01/18/2011 AT 01:10 PM EST

Just a week into the series, things are about to get deeply emotional on Teen Mom 2.

On Tuesday night's episode of the MTV reality show, Leah takes one of her twins, Aliannah, to the doctor to find out why she's developing at a slower rate than sister Aleeah.

The news isn't good, as the doctor immediately notices something is wrong and orders an MRI of Aliannah's spine – leaving Leah to make a difficult phone call to ex-boyfriend Corey, who is the twins' father.

Watch a preview of the episode, which premieres Tuesday (10 p.m. ET) on MTV.

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