April 30, 2014 10:00 AM

Kevin Mazur/WireImage

Ashley Hebert and J.P. Rosenbaum couldn’t wait to go to the doctor Monday to learn the sex of their first child.

And it turns out Rosenbaum’s wish has come true — the couple are expecting a baby boy this fall, they confirm to PEOPLE exclusively.

“I definitely saw J.P.’s profile on the ultrasound,” Hebert, 30, tells PEOPLE. “I’m gonna be living with two J.P.s!”

“As excited as I am for this, I think I’m just as excited for my parents,” Rosenbaum, 37, says. “This is their first grandchild and [now] the Rosenbaum name lives on. Not to mention that my dad already called dibs on his first baseball mitt.”

In June, Hebert will complete her dental residency in Philadelphia. Then she and Rosenbaum will focus on nesting in anticipation of their son’s arrival in October, though Hebert admits she’s already got a jump on things.

“I’m a planner, so finding out the baby’s sex early definitely makes things easier on us when planning for the future,” she says. “I’ve already started shopping for cute outfits!”

She jokingly adds, “Now all I have to do is convince J.P. that he actually really loves the name I picked out.”

Hebert and Rosenbaum met on season 7 of The Bachelorette, with Rosenbaum proposing on the finale.

In December 2012, the couple were married during a televised ceremony officiated by Bachelor host Chris Harrison.

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— Monica Rizzo

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