September 28, 2016 10:00 AM

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Katherine Heigl already knows a thing or two about motherhood thanks to her two daughters, but her first pregnancy has presented some unfamiliar challenges.

One of the biggest adjustments? Fighting those cravings for junk food, which the Doubt actress is “trying really hard to stop” giving into.

“I feel like what I need to do is just eat one donut a week,” she tells Entertainment Tonight. “Just have one and then stop thinking about it.”

While that sounds doable, temptation is always lurking — especially when she’s shooting a television show where catered confections are always an arms reach away.

“If I’m not on set, I don’t think about them that much. And I don’t eat them because they’re not around,” Heigl shares. “But on set, crafty always has a plethora of donuts in really pretty pink boxes and I can’t stop thinking about them.”

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Now that the 37-year-old Emmy winner is getting closer to her January due date, there’s another challenge on the set of Doubt: hiding her growing baby bump. Luckily, the crew has gotten creative.

“Today was really impressive,” Heigl says. “I had to come up to my desk and I didn’t know that they had strategically placed [a desk lamp]. They were like, ‘Katie, would you mind taking a small step to your right?’ And I looked down and this lamp was right there. That’s clever.”

Heigl previously adopted two children with her husband, musician Josh Kelley, daughters, Adalaide Marie Hope, 4, and Naleigh Mi-Eun, 7.

PEOPLE confirmed in June that the couple were expecting their first son.

“The Kelley clan is thrilled to announce that we are expecting a third addition to our family,” they told PEOPLE in a statement in June. “Naleigh and Adalaide could not be more excited to welcome their new sibling into the fold and Josh and I are overflowing with joy and gratitude.”

— Stephanie Petit

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