Adria Petty, who helmed the video for the singer's new single 'Countdown', claimed that the pregnancy was never meant to become a part of the visual.
However, they decided to include it to reflect Beyoncé's current happiness with impending motherhood.
Petty told MTV News: "When you work with Beyoncé, you are not only working with an intelligent and strongly collaborative individual but you are also usually battling with time and the given circumstances in her work life at that moment and, in this case, her personal life.
"So it's an evolving process that remains flexible. The target we are always trying to hit is something that feels good and genuine for her."
She continued: "When we first started shooting, she had not made that announcement and I do not believe that was the goal. But as the process evolved, I believe she wanted that to be celebrated in the video."
The director added that shooting the video had to be done over a number of months as Beyoncé had a handful of prior commitments.
Petty explained: "It was shot per Beyoncé's availability over a couple of months. She did her Roseland shows and the MTV Awards in the interim. I believe she had a number of commitments and had not anticipated her special arrival."
Since the video's debut last week, Belgian choreographer Anne Teresa De Keersmaeker has criticised Beyoncé's creative team for plagiarising her work.
> Beyoncé, Jay-Z to welcome first child in February
Watch the music video for Beyoncé's 'Countdown' below: