The 33-year-old was diagnosed with grade three cancer in May after finding a lump on her breast.
On an interview with Loose Women, Amy revealed that the day before her honeymoon with husband Benjamin Jones, she discovered a lump but chose not to share the news with him to avoid causing unnecessary concern.
She said: “The day before I went on my honeymoon, I found a lump on my breast. But I’d only recently started checking my breasts.
“I went on the CoppaFeel trek with Giovanna [Fletcher] when I was partnered with Tom Fletcher – and that’s the wonderful thing about Strictly, is the friendship it creates.
“The Fletchers welcomed me into their family. Later that year, I went on a trek with G and whilst I was on the trek, I was with ladies who were telling me their stories.”
“Some of them were walking because they’ve been through breast cancer or they were walking for somebody else and their ages were very similar to mine and I was thinking, ‘Hang on I’m here raising awareness and I don’t even check myself’.”
“So potentially CoppaFeel and the Fletchers, and Strictly partnering me with the Fletchers, has now saved my life.”
“I didn’t tell my husband Ben, I went on the honeymoon and every day you’re putting sun tan lotion on and I could feel it and I just had this gut feeling, I knew.”
When she was asked why she didn’t disclose this with her husband, Amy said: “He wouldn’t have gone on the honeymoon, I really wanted this honeymoon break and what could we have done?
“And I didn’t want to worry anybody until we knew.”
Amy is currently undergoing treatment and has been unable to compete in the new series of the celebrity dancing show.
The star showed her fighting spirit last week as she went bald on the carpet complete with a beautiful pink silk dress.