Don't worry about it, it's not your fault :) and there's nothing you can do about it now so don't fret! But you can always tell your examiners/teachers/professors that you had a bad cold and I'm sure they'll take it into consideration :)
Oh yeah, like that one time when I was throwing up and then I was pretty much fully recovered but my family still ordered pizza and didn't let me have any.
Me sadsta.