Jennifer Arellano
December 05, 2013 AT 06:12 PM EST

ABC News correspondent Amy Robach announced she had breast cancer in November, and on Thursday morning, she appeared on Good Morning America to discuss the progress of her treatment, details of her double mastectomy surgery, and the importance of early mammograms.

Robach learned of her breast cancer diagnosis after undergoing an on-air mammogram for Good Morning America‘s October Pink Initiative. She recently had her double mastectomy.

“Three weeks ago, I was in an operating room, and physically, I feel remarkably well. Mentally, it’s another challenge, because that was phase one,” she said Thursday, joined by her GMA colleagues Josh Elliott, George Stephanopoulos, and Robin Roberts.

Robach talked about the struggle to stay mentally strong, to focus on the positive: “You keep your head together, you come into work, you hug your friends, and you’re thankful to be where you are with your family and the people who matter.”

Roberts, a breast cancer and myelodysplastic syndrome survivor herself, asked Robach about the next steps in her treatment. Robach shared that she will undergo chemotherapy on Dec. 16. Her double mastectomy revealed that her cancer had caused problems in her left breast and had spread to her lymph nodes. “I made the choice to have the double mastectomy. … For me, it felt like the right choice, and it turned out to be the right choice.”

Stephanopoulos pointed out that Robach will be “working through it.” “I saw Robin do it,” Robach said, “I know how strong you were and you give me strength.”

The correspondent also spoke of her especially poignant Thanksgiving dinner: “I uttered words I never thought that I’d utter. I said I’m thankful to be alive,” she said. “And it’s good to know that you get to be thankful to be alive. It’s a reminder to all of us that you never know what’s around the corner.”

Watch Robach on Good Morning America below:

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