'Teen Mom OG' Spoilers: Season 7 Trailer Teases Catelynn and Tyler Baltierra's Rocky Marriage, Bristol Palin's Co-Parenting

Catelynn and Tyler Baltierra have experienced a number of highs and lows together since they first appeared on 16 and Pregnant in 2009. Flash forward nearly a decade later—and three years into their marriage—and the couple is still facing bumps in their relationship. They veil will be pulled back when they return to the small screen for Teen Mom OG Season 7.

A sneak peek trailer of the upcoming season teased Catelynn and Tyler's marital troubles. "If someone asked me, 'Are you happy in your marriage?' I would say, 'Absolutely not,'" a teary-eyed Tyler revealed in one tense scene in the trailer released on Sunday.

Catelynn didn't appear to be surprised by his comment and seems to feel the same. "Do you think I'm blind to it all?" she asked in response.

Catelynn and Tyler have clashed since they made their reality TV debut in 2009 and placed their first daughter, Carly, up for adoption. The couple even appeared on VH1's Couple's Therapy with Dr. Jenn in 2013 to try to solve their problems back. They managed to work things out, welcoming their second daughter, Novalee Reign, just before they tied the knot in 2015.

Not every couple on the cast is facing relationship woes though. Amber Portwood and her new partner Andrew Glennon are enjoying the thrills of parenthood after recently welcoming their first child together. "I can't think of anything else but my little family," Portwood said in a clip.

The trailer also offered the first looks at new cast members Bristol Palin and Cheyenne Floyd, both who seem to be experiencing their own familial troubles.

Dubbed "America's most famous teen mom," Bristol made headlines after she got pregnant with her first son, Tripp Johnston, during Sarah Palin's bid for vice president in 2008. Now that she's older and a married woman, Bristol says in the trailer she's hoping to use her platform to help other young moms. "If my life resonates with somebody else, then I think God gave me a platform to do that," she said.

Her life isn't without ups and downs though, especially while helping Dakota Meyer work through his PTSD. "It's been hard on our marriage," she says in the trailer. "We don't know how to co-exist together. I don't want to raise my kids to think that this is what a marriage looks like."

As for Cheyenne, who previously appeared on MTV's Are You the One, she'll be experiencing the struggles of co-parenting with her daughter's father Corey Wharton, who doesn't like the fact that her new boyfriend is living with her.

"He's seeing Ryder more than I am," Corey said. "Why don't you just be single?"

Teen Mom OG returns to MTV with Season 7 on October 1 at 9 p.m. ET.