Beyonce was "really nervous" about the surprise release of her self-titled LP.

The "Drunk in Love" singer, who is celebrating selling more than one million copies of her fifth studio record, admits it was a "huge risk" releasing it without any prior promotion. She answered fans' questions via her Instagram account at the weekend at a screening for the record's accompanying music videos.

"I was terrified. I was so scared. I already envisioned like the worst things that could happen. Honestly, I was at a point where I felt like, you know, everything feels the same. That's how I felt and if I could not challenge that, then maybe it's time for me to do something else or develop more artists, which is something I want to do," she posted. "I just hope that I continue to move forward and challenge myself, and I think now that I've become a mother, I just want my legacy to inspire people."

Meanwhile, retailers such as Amazon and American company Target are refusing to stock Beyonce after it was released exclusively on iTunes. The digital giant were given a one week exclusive window to sell the 14-song, 17-video album, which features contributions from Drake, Jay Z and Justin Timberlake.