Name Change and U/S Date

Tim and I have decided if we have a boy we are going to name him Lincoln James instead of Donovan James. Its a name we ran across recently and both really liked. I have my 16 week appointment on November 7th. I asked Dr Williams if we could get an ultrasound to see what we are having on that day and he said that we can try. 16 weeks is still a little early for that, normally its done between 18 and 20 weeks, but I know several people that were able to tell as early as 15 weeks what they were having, so I'm feeling optimistic about it. I just want to know so I can start planning the nursery and buying some things.