beyonce-miscarriage.jpgIn her new HBO documentary, Life Is But a Dream, Beyonce Knowles reveals that she suffered a miscarriage.

"About two years ago, I was pregnant for the first time," Beyonce says in one clip. "And I heard the heartbeat, which was the most beautiful music I ever heard in my life ... I picked out names ... I envisioned what my child would look like ... I was feeling very maternal."

But shortly after learning that she was with child, she lost the pregnancy. "I flew back to New York to get my check up -- and no heartbeat," she says. "Literally the week before I went to the doctor, everything was fine, but there was no heartbeat."

So how did she cope with the tragic loss? "I went into the studio and wrote the saddest song I've ever written in my life," she says, but she doesn't reveal which song it was. "And it was actually the first song I wrote for my album. And it was the best form of therapy for me, because it was the saddest thing I've ever been through."

Of course, Beyonce did successfully get pregnant the following year, and in 2012 she and hubby Jay-Z welcomed a beautiful baby girl, Blue Ivy Carter. "Being pregnant was very much like falling in love," she added. "You are so open. You are so overjoyed. There's no words that can express having a baby growing inside of you, so of course you want to scream it out and tell everyone."