updated 04/09/2012 AT 3:35 PM ET
•originally published 04/09/2012 AT 7:10 PM ET
“I feel really good … [though] this time I had a little more morning sickness,” she told PEOPLE Monday at the New York City launch of the new Windows phone, the Nokia Lumia 900. “I think it’s a little bit harder being pregnant when you have a toddler [son Mason, 2] I’m chasing after. Last time I could nap more.”
As hectic as this pregnancy has been, Kardashian says it keeps her on the move.
“I’ve been active chasing after Mason,” Kardashian, 32, says. “We go on walks all the time. Pushing the stroller is like carrying all these weights, and then [there’s] the extra weight on my stomach, so it’s good. It’s fun.”