Nope, unfortunately you don't for the 'free' upgrade... You had to have bought after the 8th October.
However if you go to the apple 'up to date' site and enter your machine serial number, you may have some luck...
Lots of people who like you bought PBs before the 8th, found that they qualified through the website anyway...
If you do a search, you should find some long and informative threads detailing this...
Peace,
Marc