Teen Mom’s pregnant Cheyenne Floyd fights tears as she fears for baby’s health due to daughter Ryder’s genetic disorder

PREGNANT Teen Mom star Cheyenne Floyd has been seen fighting back tears as she opened up about her concerns for her baby's health.

In a preview for tomorrow night's episode of the MTV show, discussed the chances her second child may be born with a genetic disorder.

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Cheyenne's , four, who she shares with ex Cory Wharton, already suffers from VLCAD deficiency, a rare genetic condition that prevents the body from breaking down certain fats.

The reality star is yet to find out whether the disorder, which causes low blood sugar, lack of energy and muscle weakness - will affect her unborn child.

In the upcoming episode of , Cheyenne and her partner Zach Davis undergo a genetic screening to find out the chances.

"I'm getting anxious about getting the baby's genetic screening like we did for Ryder," Cheyenne tells the cameras, before sitting down with Zach.

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She explained to him that the genetic test being negative on his end would mean that their baby would be healthy and only have a chance of carrying the condition.

"If your test comes back positive, then the baby has a one in four chance of having it like Ryder does," the star went on to explain. "So Ryder was in the rare little 25 per cent."

Cheyenne began to look upset and held back tears as she apologised to for being "thrown into this situation".

"I'm going to be on edge," she said, as Zach encouraged her to instead focus on her upcoming gender reveal and "keep her stress levels down".

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"It sucks that we even have to have this conversation, it sucks that we have to take these steps, it sucks that the baby is at risk," the MTV alum concluded.

"I'll be so confused and just in shock, so I'm going to pray on it."

Cheyenne recently threw a as she celebrated turning four with a giant cake.

The soon-to-be mom-of-two took a break from setting up  and her nursery for her unborn son to celebrate her firstborn.

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Last weekend,  celebrated her daughter's fourth birthday with an adorable get-together featuring her, her boyfriend Zach Davis, her ex , and his girlfriend, .

For the birthday celebration, the  star rented out a play space for the kids to play safely as they mounted tiny carousels and had plenty of space to run around and play.

The birthday bash was themed after animated children's series Octonauts with graphic plates, cups stuffed with coloring materials, and hanging decorations. There was also a gold banner that read "Happy Birthday."

The 4-year-old wore a blue tutu with black biker shorts, white tee that had her name written on it and a blue hair bow.

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Following the celebrations, Cheyenne took to  to celebrate her daughter with a series of photos and an emotional post.

She wrote: "My sweet big girl, I could cry at how big she is getting!! Can’t believe she’s going to be four next week."

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Cheyenne and boyfriend  - who have been  - announced in December that they are getting ready to welcome a baby with a sweet maternity photoshoot.

Just days later, Cheyenne .