yeah,another week is good.dont worry about the fact you fed just 3 days ago,you can still flush today.are you growing in soil???if so just give a really through flush.
if you have a ppm reader,check the ppm of the run off after the flush,the lower the better.if you dont have one,it doesnt really matter.just run 4 or 5 times the amount of water through the soil instead of 3 times the amount.so for example,if you are growing in 3 gal pots,put 4-5 times that amount of water through the soil.that should be good enough.