Pregnant 'Teen Mom OG' Star Catelynn Baltierra Expecting Baby No. 3 With Husband Tyler

Despite the martial chaos teased between Catelynn and Tyler Baltierra in the Teen Mon OG trailer, the couple is currently experiencing happier times. The reality TV couple announced they were expecting their third child during an interview with Us Weekly on Thursday.

"The big news is that we are expecting our rainbow baby. This baby is our rainbow after the storm. I'm super excited," Catelynn said. "It was a huge shock at first. We were not planning it, especially after the miscarriage and how I went downhill with my mental illness."

The 26-year-old said she and her husband originally were holding off on trying to conceive again after her miscarriage earlier this year. "We were using protection and everything and still got pregnant. This baby just wanted to be here. It was very unexpected," she said.

The couple announced they were expecting back on an episode of Teen Mom OG in January. Catelynn's miscarriage was revealed in February. The young mother battled depression following the miscarriage and underwent treatment. She previously suffered from postpartum depression and suicidal thoughts after giving birth to the couple's 3-year-old daughter Novalee Baltierra.

The couple's first daughter, 9-year-old Carly, was given up for adoption when they appeared on the MTV spinoff's original reality series, 16 and Pregnant, in 2009. The Teen Mom franchise has documented the plights of open-adoption Catelynn and Tyler have experienced over the years.

Another baby is on the way for #TeenMomOG’s @CatelynnLowell and @TylerBaltierra! 👶

— Teen Mom (@TeenMom) September 13, 2018

The new season trailer hinted at rocky waters in the couple's marriage. In one particular scene in the clip, Tyler, 26, expressed the dissatisfaction he felt in his relationship and said, "If someone asked me, 'Are you happy in your marriage?' I would say, 'Absolutely not.'"

Catelynn appeared to share in his sentiment. "Do you think I'm blind to it all?" she asked.

It's no surprise the Baltierra's will face some trouble in their relationship when the new season airs. There was speculation the couple was headed towards a divorce after Catelynn changed her last name on Instagram back to her maiden name of Lowell. She shot down the rumors and said she and Tyler weren't getting a divorce in May. "Couples go through ups and downs. That's normal life," she said.

Its possible fans will see the couple's reconciliation and maybe even their latest baby announcement on the upcoming season of Teen Mom OG.

Teen Mom OG returns to MTV on October 1 at 9 p.m. ET.