Braving the Shave for Macmillan Cancer Support - will I lose any pounds from hair loss I wonder? lol

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Hi all,
I hope you don't mind me posting this, but I'm currently trying to raise funds for Macmillan Cancer Support's "Brave The Shave" campaign and if you would like to donate to help reach my target, you can go to: http://bit.ly/1MaB7uh I also have a facebook page: http://on.fb.me/1Mt5DQY

Asides that though, I am really trying hard to lose weight and it just occurred to me this morning that I wonder if once I have my hair shaved off, if it will affect my weigh in for that week? lol I don't mean to sound disrespectful to anyone that has lost their hair through ill health or other reasons, but I am curious...