Doctors ordered Beyonce to cancel a show in Belgium, further fueling speculation that the pop star is pregnant with her second child. She and her rapper husband Jay-Z welcomed daughter Blue Ivy in January 2012.

Queen B is currently on the European leg of her "Mrs. Carter Show World Tour" and was forced to axe a Tuesday performance at Sportpaleis in Antwerp.

Beyonce's rep told the Associated Press that the singer is suffering from exhaustion and dehydration. However, rumors have been swirling that the real reason behind the cancellation is related to her secret pregnancy.

The pop star is scheduled to perform at Sportpaleis on Wednesday. Her rep says they are awaiting approval from medical personnel to determine whether the show will go on.

She told "Good Morning America" earlier this month: "I would like more children. I think my daughter needs company. I definitely love being a big sister and at some point when it's supposed to happen. My biggest job in the world is to protect my daughter and I am very protective."