TEEN Mom's pregnant Catelyn Lowell shared a video of her baby's heartbeat as the star prepares for the birth of her fourth daughter.

Back in February the reality star and her husband, Tyler Baltierra, announced that they are once again expecting after suffering several miscarriages.

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Catelynn, 29, took to her Instagram Stories to share a clip listening to her baby's heartbeat on a device called a Pocket Fetal Doppler.

"Love this sound" the MTV star wrote over the short video, as a constant, gentle beating can be heard.

In another Story, Catelynn is seen continuing to listen to the heartbeat, but this time she writes, "It's a girl," and then, "girl mom."

All this comes just a month after Catelynn and Tyler, 29, revealed they will be expanding their family just a short time after losing a baby.

She told Celebuzz at the time: "I was definitely surprised that we got pregnant so fast with this baby! But we are so excited."

The Teen Mom OG star also touched on about how when she first told Tyler, he wouldn't believe her.

"I just handed him the positive test,” Catelynn said, adding that Tyler didn't believe the news until Catelynn “missed [her] period and took another test that was positive.”

Previously, Catelynn revealed the couple already had a name picked out for their little one, however, recently the mother of three asked fans if their fourth daughter should have a "Z" or a "R" name.

Catelynn and Tyler are already parents to Nova, six, and Vaeda, two, as well as 11-year-old daughter Carly, who they placed for adoption.

While Catelynn has been very open about her pregnancy, she has also not shied away from talking about her battle with depression and suicide ideations.

She recently reached out to her fans who may be going through a similar battle, writing: "Isolation is the worst thing when anxious. I know it’s HARD to not do it but we have to FORCE ourselves to go outside, call a friend, go for a walk and talk.

"I PROMISE reaching out will help you in so many ways #mentalhealthmatters #yougotthis."

Along with the message, she shared a picture that read "Don't let your anxiety convince you to isolate yourself."

Things have also been getting quite stressful in Catelynn and Tyler's household, as a recent Teen Mom OG episode saw the pair duking it out.

The nasty argument began during a family day out to an apple orchard where there was due to be a bounce house for daughter Nova.

However, Tyler would soon snap at Nova, which led to Catelynn calling her husband a "d**k."

The chaos led Nova to start crying because of the raised voices and mean words being shouted back and forth.

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