Jenelle Evans and David Eason say raising five kids is a "hectic" experience.
"I think we're good," Evans said of having another baby. "We have a lot of kids together."
Evans and Eason share 5-month-old daughter Ensley. The reality star is also mom to sons Kai and Jace, while Eason is dad to daughter Maryssa and son Kaden.
Three of the kids live with the couple full-time.
Evans and Eason got engaged in February, and told E! News they plan to marry in September.
Evans denied she's pregnant in a series of tweets Thursday, telling her followers she got an IUD after Ensley's birth.
You guys really think I want to be huge and pregnant at my wedding?! You're crazy!" the star added.
"But you guys probably don't believe me, haha I don't care. We will see who has the last laugh when it comes time for my wedding!"
Evans came to fame on the MTV series "16 & Pregnant" before starring on "Teen Mom 2."
The show co-stars Chelsea Houska, Kailyn Lowry and Leah Messer, and will add Briana DeJesus in Season 8.