It takes more than some dehydration and exhaustion to keep Beyoncé down. A day after [article id="1707312"]postponing a show[/article]
 in Antwerp, Belgium, on doctor's orders, the singer posted a heartfelt note to fans apologizing for what she claimed was her first missed gig ever.

"To my dearest fans in Antwerp," read the handwritten letter posted on her Facebook page. "I've never postponed a show in my life. It was very hard for me. I promise I will make it up very soon. I'm sorry if I disappointed you. Thank you for your concern. I'm feeling much better now and I'm ready to give you a great show."

Though her spokesperson said on Monday that it remained to be seen if Bey would be able to recover in time for the second Antwerp show, the singer signed off by saying, "see you tonight."

The tour kicked off in Serbia on April 15 and is scheduled to continue through an August 5 date at the Barclays Center in Brooklyn. She has played 20 dates so far and has 11 European shows left after the Antwerp gigs before the production kicks into gear again with a June 28 date at the Staples Center in Los Angeles. The postponement comes just one day after the latest rumors popped up that Bey, 31, might be pregnant with her second child with husband Jay-Z.

A spokesperson for the singer did not return requests for comment on the postponement or the pregnancy rumors.

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