Click on "File" then "Print"...
Select the printer you're using and click on "Properties" on the right side.
Select the "Effects" tab and check that menu. There's a way that you can scale a page to print at, say, 50% of its normal size. Make sure your setting is on "Actual Size."
Also, this rarely happens, but make sure you're view of the document is normal and you're not completely ZOOMED in on a very small font. That could also be a problem.
Chris