The Duke and Duchess of Cambridge prince william kate middleton pregnant royalty King Edward VII Hospital  Spread Pictures

Prince William left the King Edward VII hospital in London looking concerned after visiting his pregnant wife Kate Middleton.

Aside from worrying about his wife, The Duke of Cambridge may have to return to Royal Air Force duty which could take him away for months.

The Duchess of Cambridge was admitted to the hospital on Monday with an extreme case of morning sickness. WIlliam has been at Kate's bedside every day this week.

Pippa Middleton and brother James also payed a visit to their sister's hospital room. Kate is reportedly between 7 to 8 weeks along in her pregnancy.