When I cycle a new tank, I don't bother to test the water for at least two weeks, often for a month (unless you are charting the parameters for fun of profit!). IMO, you are going to have a longer unstable period while the live rock continues to eject detritus and suffer die off, so after the tank does 'stabilize' please check your water parameters at least weekly.
For the future - 'fresh' LR isn't the best place to get an infusion of bacteria. A piece of live rock or some sand from an established tank is. 'Fresh' LR has to acclimate to your tank and not only goes through its own bacterial cycles during that acclimation, but cycles with the other life on the rock as well. When the other life cycles, it can perturb the cycles of the bacteria.
I am not a fan of 'fresh' live rock at all. Most of the stuff on it dies and it can often have unpleasant hitchikers. Many have turned to 'cooking' live rock if they have to get it fresh in order to avoid problems. Cooking is simply putting the live rock in a container of saltwater with a skimmer and a heater and letting it sit, possibly with waterchanges, for several months.