Depends on the temperatures at which you're conditioning as to precisely how long it will take... but a week is too early, for sure. We use DME for priming, and it seems to take about 3 weeks to get good carbonation. Carbonation isn't usually detectable for us at a week, particularly in the winter when it's cooler.
Seriously, just wait a bit. I bet your beer will be yummy--first batch always seems to be!