It probably wouldn't go much lower anyway, but it's always a good idea to take the SG at least three days apart to see if it's changing. If you took the SG two days ago and it was 1.011, then no worries about bottle bombs. If you didn't, well, hopefully it was done.
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Just because people leave their beers in the primary for 2 or 3 weeks (or longer) doesn't mean it's fermenting that whole time. I had one beer finish in 5 days, and I bottled it 2 days later. As long as your gravity readings stay constant, you're fine. Your FG is low enough that it probably wouldn't ever go lower. However, if you bottled at 1.018 then you might have been in trouble. 5 ounces of priming sugar will raise your gravity by roughly 3 points.