"Scott keeps getting scared, but he's been great with my mood swings so far," she told the mag. "He's like, 'Just take a deep breath.' He heard that with the last three months [of a pregnancy] you really have mood swings so he was joking, 'Oh, you're not going to believe the mood swings!'"
But she said it's sister and "Kourtney & Khloe Take Miami" co-star Khloe who's helping keep her calm.
"If someone is annoying me – usually my mom! – I'll call Khloe and it'll make me feel better because she'll agree with me," Kourtney said.
The star also told the mag earlier this week that she'd thrown Scott a "man-shower" in Miami with a dinner at the Fontainebleau hotel's Gotham Steak steakhouse, where they were joined by Kevin Federline, girlfriend Victoria Prince, Cisco Adler and Shwayze.
"We were joking that it was Scott's 'man shower,' like his version of a baby shower," Kourtney said. "Guys get excited too about having a baby, so they should do something too."
She's not the only Kardashian spending time with her man.
Khloe, who's been stepping out with LA Lakers forward Lamar Odom in recent weeks, earned a big compliment from her new boyfriend on Saturday.
Related Content from AccessHollywood.com:
PLAY IT NOW: Access Extended: Khloe Kardashian Talks 'Kourtney and Khloe in Miami'
PLAY IT NOW: Kourtney Kardashian Talks Taking 'Miami' (July 11, 2009)