Like malkore said, it is really up to you when you rack to secondary, it at all. If you are going to rack to secondary, wait another couple days and check the gravity again. If it is the same, go ahead and rack it.
The alternative is to just leave it in the primary for a 3 weeks, and then straight to the bottling bucket and bottle it from there. There a many threads out there about not using a secondary.
People have success doing both. I go for the no secondary approach, because it is one less time I have to handle the beer, and get good results withought increasing the chance for infection.