En una entrevista Beyonce confezó que pasó el momento más triste de su vida cuando perdió su primer embarazo hace dos años:

"About two years ago, I was pregnant for the first time," Beyonce says in the doc airingFebruary 16, via Us Weekly. "And I heard the heartbeat, which was the most beautiful music I ever heard in my life."

"I picked out names," she adds. "I envisioned what my child would look like . . . I was feeling very maternal."

"I flew back to New York to get my check up -- and no heartbeat," she reveals. "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," she said, leaving the song title a mystery. "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."