Have you tried this? It's unlikely but worth a try. (I use Word2003 so it might not be exactly the same.)
From within your document click Format > Reveal Formatting (Shift-F1 does this too) >under Options in the help box that open on the right, check the "Show all formatting marks" .
See if you have any strange page breaks or a string of paragraph symbols.
Another test is to open a new blank document and cut/paste the few lines you've typed. Don't include any footers. If the extra pages reappear, then it's probably in your page set up: File>Page Setup>Layout
Hanlon’s razor: Never attribute to malice that which is adequately explained by stupidity.