How long after having the novasure procedure will my period begin to change?

Hi, I had the Novasure procedure done on Sept. 29, 2009. I was having 7-10 day heavy periods so my Dr. recommended it.  After the procedure I had light bleeding and discharge for about 4 weeks, then I got my regular period almost a week later. I am now on my second cycle since the procedure and haven't seen any changes. My period still flows heavily as if nothing happened. My question is how long should It take to see any results, or is this a sign that the procedure didn't work?