Maci Bookout doesn't just get engaged during the upcoming season of Teen Mom OG -- she also discovers she is expecting her third child.

In a sneak peek at the new season, Bookout and her fiance, Taylor McKinney, are seen chatting about her recent weight gain when McKinney brings up the idea of a possible pregnancy.

"You don't think, like, you're pregnant, do you?" he asks, according to a report by OK! Magazine on Monday.

When Bookout quickly shakes her head, McKinney continues on, telling his soon-to-be-wife that he would be on board with the idea, despite having welcomed their daughter Jayde just months prior.

"It may be crazy timing, but I’d be pretty excited,” he says.

“You have lost your mind, we would have two kids under two, we would need a bigger car, a bigger house,” she tells him.

"You know, I took a pregnancy test when I was 16 and I didn't cry then," Bookout continues. "If this one says positive..."

"You might cry then?" McKinney interjects.

"Yep," she replies.

While the results of the pregnancy test aren't seen in the sneak peek, Bookout did end up being pregnant and in May of this year, just one day after her daughter celebrated her 1st birthday, Bookout welcomed her third child (the second for McKinney), son Maverick Reed.

For more of Maci Bookout and Taylor McKinney, tune into Teen Mom OG season six premiering tonight, Aug. 22, at 10 p.m. on MTV and check out a sneak peek at tonight's new episode below.