(CNN) Cancer was the last thing on NBC correspondent Kristen Dahlgren's mind.

Kristen Dahlgren appears on "Today" on Wednesday .

Dahlgren shared her story Wednesday with "Today" and said she believed she was low risk.

"I'm in my 40s. I'm active," she said. "I don't have a family history of anyone getting breast cancer early -- and perhaps most importantly, in April I had just had a mammogram that was negative."

But on her 47th birthday she noticed a slight dent in her right breast.

"Beneath the dent, I didn't feel a lump, but something I might describe as a 'thickening,'" Dahlgren said. "It just felt different than everywhere else."

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