After Hebert reportedly took a few pregnancy tests which didn't reveal any results with certainty, the former The Bachelorette star tried another home-pregnancy test in Santa Barbara, CA on the day Lowe and Giudici exchanged vows.
"There was legitimately a line," Rosenbaum told the magazine. "That's when we officially found out -- of course it would be at a Bachelor wedding!"
Hebert and Rosenbaum told Life & Style in April 2013 they'd be ready to start having children once Hebert finished her dentistry residency in June 2014.
"Anytime after that June is fair game," Rosenbaum told Life & Style at the time.
"So June 1!" chimed in Hebert. "I want one [child]."
"We're having two kids. She's putting up a fight now, but she'll go for two!" Rosenbaum subsequently joked.
Hebert had previously admitted she'd like to have a baby girl, while Rosenbaum was reportedly hoping for a boy.