In a teaser for the upcoming season, the women ofTeen Mom OG—Amber Portwood,Catelynn Lowell,Cheyenne Floyd,Maci BookoutandMackenzie McKee— face new highs and lows including parenting woes, pregnancy news and even an emotional engagement.

Cheyenne is seen accepting a proposal from her boyfriend and the father of her second child,Zach Davis.

“Oh my god, it’s huge,” she says in tears as she puts on her engagement ring.

And Catelynn is also celebrating some big news: the pregnant mom is expecting her fourth child with husband Tyler Baltierra — and it’s another girl!

Teen Mom OG and Teen Mom - Young and Pregnant

But the group also faces new challenges. After moving to Florida, Mackenzie, 26, begins to notice some behavioral issues with her kids.

“He’s biting and hitting at school,” she says.

Amber, meanwhile, is pursuing her degree in psychology as she works to rebuild her relationship with her daughter Leah. And Maci is working to cope with her PTSD while juggling her family life.

“I’m 17, I still need help,” Madisen says.

Teen Mom OG and Teen Mom - Young and Pregnant

“You lied to me the whole f—— time,” she says in the teaser.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

But Kayla J isn’t the only mom dealing with problems in her romantic life. Rachel’s relationship is flipped upside down when her daughter’s father is suddenly arrested and ends up back in jail.

Teen Mom OG and Teen Mom - Young and Pregnant

And Kayla’s boyfriend, Luke, is considering adopting her son, Izaiah, but one of her exes makes an unexpected return and demands to have a paternity test.

As for Brianna and Kiaya, both women are struggling to navigate their relationships with their own motherly figures.

source: people.com