It wasn't until Jay-Z released a song named "Glory" that anyone knew Beyonce had a miscarriage a few years ago. In Beyonce's upcoming HBO documentary, the proud mother of Blue Ivy explains what it was like to lose her first baby.

"About two years ago, I was pregnant for the first time. 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."
Things later took a turn for the worst.
"I flew back to New York to get my check up — and no heartbeat. Literally the week before I went to the doctor, everything was fine, but there was no heartbeat.
"I went into the studio and wrote the saddest song I've ever written in my life. 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."
She describes what pregnancy was like for her.
"Being pregnant was very much like falling in love. 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."