You can't really ascertain all that much from your gravity reading, unless it was from the mixture of all of your runnings, pre boil, and you know the volume.
If you're going to leave it in the primary 3-4 weeks (which I recommend), then taking a gravity reading at this point is really unnecessary. If it isn't done at that point, then there isn't much that you can do, unless you're really determined to get .003 more off the FG. Besides, knowing the FG without the OG really won't tell you all that much--just take a reading when you bottle if you really want to know for next time.
Final Verdict: RDWHAHB.