When you keg you can:
1) Set the co2 tank regulator to the designated psi setting and let it sit for a while.
2) Set the co2 tank regulator to about 30psi and shake and eventually drop down to serving pressure (There are many threads on this about how much/how often and when it regulates to the right amount of pressure.)
3) Prime the keg with sugar instead of using co2 to carbonate and in a few weeks use the co2 just to dispense. (Best when you have kegs sitting around which won't be dispensed for a few weeks anyways, and if you want to save on co2.)
Since it's almost been a week, I'd say leave it as is.