January 25, 2013 09:00 AM

Ben Gabbe/Getty

Looks like probability isn’t exactly Jenna Fischer‘s forte.

During a Thursday appearance on The Jeff Probst Show, the actress admitted she once believed motherhood wasn’t all baby bliss — but son Weston Lee has proven her wrong.

“When I went into it I thought, ‘Okay, I bet it’s going to be really great 70 percent of the time, and then 30 percent of the time, you just have to get through it,'” The Office star, 38, said.

“And I was like, ‘I can do that, I can do that.’ I love it 100 percent of the time. I honestly do.”

Welcoming her first child with husband Lee Kirk has allowed Fischer to dig deep, discovering strengths — and levels of sleep deprivation! — she never knew existed. “I did not know that I had this much patience,” she says.

“I had really underestimated what I was capable of because, before I had him, I thought I needed things that I didn’t really need. I want nine hours of sleep, but it turns out I don’t need it!”

But despite the sudden lack of shuteye, no one will catch the new mama struggling through her time spent with her 16-month-old.

“I’m not cranky during the day because … the excitement of being with him and watching him learn and watching him grow and being a facilitator of those things is so joyful,” Fischer explains.

Courtesy Jenna Fischer

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— Anya Leon

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