Beyonce has made the first official cancellation of her Mrs. Carter World Tour, cancelling a show in Antwerp, Belgium that was scheduled to take place tonight. A rep for Beyonce said the Belgium show was cancelled due to "exhaustion and dehydration" and that she had been ordered to by her doctors to rest. The second Belgium show scheduled at the same arena for tomorrow night has not been cancelled, but no official decisions have been made yet. Her publicist said that she is "awaiting word from her doctors before making a decision" about whether to cancel the second Belgium show.

Cancelling the Belgium show fanned rumors that Beyonce is currently pregnant. Multiple sources told the New York Post after last week's Met Gala that Beyonce is expecting another baby, while numerous photos directed attention to her supposed baby bump. Pregnancy rumors then flooded the internet yesterday.

Last February, Beyonce told Oprah Winfrey in an interview that she would want to have another child when her world tour is completed. She has also been open about her desire to expand her family in previous interviews.

"I would like more children. I think my daughter needs some company. I definitely love being a big sister. At some point ... when it's supposed to happen," she said to ABC News.

Beyonce famously announced her first pregnancy at the 2011 MTV Video Music Awards in September 2011 and then gave birth to her first child, a daughter named Blue Ivy, in January 2012. She is currently married to rapper Jay-Z.

Beyonce started her Mrs. Carter World Tour last month in Belgrade, Serbia. It will conclude on August 5 at the Barclays Center in Brooklyn.