But they both claim to have previously predicted whether they'll welcome a son or daughter in June 2019.
"We were correct," Arie noted of the gut feeling he shared with his fiancee. "But I think either way, we're so excited. I think we both were not really leaning one way or the other."
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Lauren revealed she spent the month of October crippled with nausea and morning sickness.
Because of her pregnancy experience so far, the blonde beauty acknowledged she may want to wait awhile before conceiving Baby No. 2 -- although she and Arie agree they'd like to have more than one kid.
"I just had the most miserable month of my life," Lauren told the magazine. "So I was excited at first to have a bunch of kids back-to-back, but I think we're going to see how the first one goes and then decide after that."
Thankfully, Lauren is feeling better with the Thanksgiving holiday right around the corner.
"Over the past week I've started feeling better," she noted. "It's nice to have my energy back."
Lauren, who is reportedly pursuing a career in real estate, and Arie purchased a home together in Phoenix, AZ, in April 2018, just one month after getting engaged on The Bachelor: After the Final Rose special on ABC.
Arie popped the question after ending his first engagement to the actual winner of The Bachelor's 22nd season, Becca Kufrin, who went on to star on The Bachelorette's fourteenth season.
Becca is now engaged to her season's winner, Garrett Yrigoyen, and their relationship appears to be doing well.