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Kate Middleton to Remain in the Hospital 'Several Days' More

John Stillwell - WPA Pool/Getty Images(LONDON) -- Kate Middleton is spending her second day at King Edward VII Hospital in London after she was admitted on Monday following the announcement of her pregnancy.  And she may have to stay there at least several more days.

The Clarence House confirmed to ABC News that Kate will be in the hospital for "several days," and will then require a "period of rest" battling severe morning sickness.

Prince William has been the only member of the royal family seen visiting Kate in the hospital.  William departed the hospital Monday night around 8 p.m. before arriving again Tuesday morning to be at his wife's bedside.

A palace source told ABC News that the royal couple decided to go public with the pregnancy because Kate had to be hospitalized.

"Well they didn't want to let it out because she's still probably about the 10-week mark but they knew that once Kate was seen going into the hospital… that it was going to be out of their hands and then the media would have control of the announcement," Ingrid Seward, editor-in-chief of Majesty magazine, told ABC's Good Morning America.

William and Kate were spending time with her parents in Bucklebury when she became ill with the symptoms of hyperemesis gravidarum, or acute nausea.

Prince William sprung into action and drove his wife along with their personal security team 50 miles in their Range River to the hospital where Kate was placed on an IV drip.

The royal family was only notified of Kate's pregnancy mere hours before the rest of the world.

"They quickly told the queen, Prince Charles, Prince Harry and then they made the announcement at 4 o'clock yesterday," Seward told GMA on Tuesday.

The announcement follows relentless public and media speculation about when Prince William and his wife would have an heir.  The guessing game began almost immediately after the couple said, "I do" in April 2011.

It's customary for the royal couple to have a child within the first year of marriage.  Princess Diana gave birth to William just 11 months after her wedding, and the queen gave birth to Prince Charles six days before her first wedding anniversary.

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