"Mila just wants the baby to come out already!" a source told PEOPLE.
Kunis, 31, has been biding her time by attending prenatal yoga classes, going for walks and spending quality couple time with Kutcher.
"Mila hasn't slowed down at all," says an insider. "She seems to have a lot of energy."
On Wednesday, the mom-to-be stopped by a Los Angeles Target for some last-minute shopping. She also tucked into a meal at POT restaurant in Koreatown.
Meanwhile, the Two and a Half Men star, 36, has kept busy himself by working – and Tweeting a photo on Wednesday from the set of his hit CBS show, showing a room filled with gigantic stuffed animals, ride-on cars and other toys.
Nesting.... Too much? pic.twitter.com/5wXn8SdjXT— ashton kutcher (@aplusk) September 24, 2014
"Nesting... Too much?" he asked in the caption.
While a source previously told PEOPLE that Kutcher is "incredibly excited" to become a dad,, he also has some understandable first-time parenting jitters. "He is a nervous wreck," the source added.
Dr. Steven Ordorica, a top obstetrician/gynecologist at NYU Langone Medical Center in Manhattan (he is not treating Kunis), says it's all about patience when it comes to going into labor. Although it's good to stay active, "there is no evidence that it would initiate labor," he says.
Kunis "is a first-time mother, so she's likely to go past her due date," Ordorica adds. "It can be very frustrating because the baby should be out already."
Reporting by PERNILLA CEDENHEIM