When 32-year-old Christina Sanz found out she was pregnant with her second child, she and her husband, Jeremy, were elated. The couple had been trying for months to get pregnant after suffering a miscarriage.

"It was a very, very happy time," Sanz tells TODAY.com.

However, everything changed about a week later when Sanz made a chance discovery while taking a shower — one that saved her life, she says.

Sanz, a former teacher from Yonkers, New York, was only about four or five weeks along at the time. "Back in January, after I found out I was pregnant, I was doing a breast self-exam in the shower, which is something I always kind of did," says Sanz.

A self-exam involves feeling the breasts for any new or unusual changes, such as lumps, which you can perform at home, per the Cleveland Cl

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