Whitney Thore Lennie Alehat
Lennie Alehat responded to Whitney Thore telling him she was pregnant on the second episode of Season 4 of "My Big Fat Fabulous Life." TLC

Pregnant “My Big Fat Fabulous Life” star Whitney Thore finds out if ex-boyfriend Lennie Alehat will be there for her and her baby on the second episode of Season 4 Tuesday.

“I have to tell you something and I don’t want you to freak out, OK?” she say in an exclusive clip obtained by Us Weekly Tuesday. “I’m pregnant.”

Alehat is shocked when his ex-girlfriend tells him the news. “You’ve got to be f---ing kidding me,” he tells the cameras in a confessional video. “You’re not just fucking with me right now?” he asks Thore.

Thore is insulted by the question. “You don’t believe me?” she asks. “I would never lie about this. I get it that he just wants to see it, but asking me just seemed offensive to me,” Thore tells the cameras.

Alehat is confused when he sees the pregnancy test, saying he doesn’t know what “that means.” Thore than says two lines means pregnant. He asks for certain if the baby is his and Thore confirms she hasn’t been with anyone else.

But Alehat quickly explains his trepidation: “I've had an ex-girlfriend tell me she was pregnant to try to get us back together before and it's just kind of a scary situation.”

He then brings up Thore’s condition, polycystic ovarian syndrome, which makes it difficult for women to get pregnant. “I mean, I thought you were on birth control,” he says, “And I thought PCOS made it almost impossible for you to get pregnant.”

Thore doesn’t mention PCOS, but adds she hasn’t been “perfect” with her birth control. When asked what they’re going to do, the TLC reality star says she will have the baby and is pleased when Alehat confirms he will be there for the child.

“I was certain that Lennie was going to get up and leave, and I'm shocked when he doesn't,” she says.

To find out what happens on the next on “My Big Fat Fabulous Life,” don’t miss the reality show when it airs Tuesdays at 9 p.m. EST on TLC.

Follow me on Twitter @mariamzzarella