January 21, 2015 08:00 PM

Paul A. Hebert/AP

Claire Coffee is going to be a mom!

“We had definitely been planning for this because we both have such crazy schedules,” the Grimm star, 34, exclusively tells PEOPLE of expecting her first child with her husband, Chris Thile of the Punch Brothers.

“They talk about those mothering hormones kicking in around age 30 and that definitely is true. It’s been something I’ve been excited about for a while.”

In fact Coffee, who will welcome a son in May, was so eager to find out she was pregnant that she almost missed out on learning the happy news.

“I’m not a patient person and I didn’t realize you had to wait 10 minutes for the double lines to show up on those little pregnancy tests,” the actress says. “So I kept trying and just seeing the one line and I thinking, ‘Oh well, maybe next time.'”

“Later, I was taking out the garbage and I saw these little pink double lines in the trash,” she recalls. “It was very exciting and my husband was in town so we were together.”

Now that Coffee is six months along, the couple have already picked out a few favorite potential names and are starting to convert Thile’s music room into a nursery.

“We’re working with what is in there already, so there’s some reds and blues and blacks going on,” Coffee says of the room. “I’m trying to buy as little as possible beforehand because my girlfriends all say you won’t know what you need until you meet the baby and know what they prefer.”

— Patrick Gomez

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