EXCLUSIVE: Vanessa Carlton Talks Pregnancy Loss

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Singer Vanessa Carlton, 33, is talking for the first time about getting diagnosed with an ectopic pregnancy in this exclusive clip from her upcoming appearance on The Doctors, explaining that the initial pregnancy was a surprise for her and her fiancé, Deer Tick lead singer John McCauley.

"I have PCOS, which is Polycystic Ovary Syndrome and I was told by a doctor that maybe I couldn't even conceive, so I was thinking it would maybe be a year before I could even conceive and it happened in a month, so in that sense it was a real surprise for us," the A Thousand Miles singer says.

Pics: Star Sightings

Carlton announced that she was pregnant during the first week of her tour, but after being diagnosed with an ectopic pregnancy, she later underwent emergency surgery to remove her right fallopian tube. After experiencing "intense nerve pain" in one of her incisions, she had to cancel the first four November dates of her tour.

"The day after our NYC show on October 15th, I was diagnosed with an ectopic pregnancy, or in my case it was a fallopian pregnancy (the embryo settled in my tube, which is the width of a straw.) This is not considered a viable pregnancy because the fetus cannot develop and it is a high risk situation for the mother because of the potential for tubal rupture and internal bleeding," she explained on her Facebook page on November 5.

Check out the clip to hear why Carlton, who describes herself as "very private person," is talking so openly about her health.

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Watch The Doctors on Tuesday, December 3, on CBS, for Carlton's full interview, including a discussion with Dr. Isabel Blumberg, OB/GYM, who performed her surgery.