Its unusual to go straight from the nitrite spike down to processing nitrite(NO2) to zero within 12 hours. Usually there's a period after the nitrite spike when nitrite will process down to zero but it will take somewhere -between- 12 and 24 hours, closer to 24 hours. But this entire fishless cycle has been appearing to move very quickly, so if you keep getting double zeros, I'd agree that it can be considered that you are moving in to your qualifying week -- however, if you had lowered your dose level below 5ppm during the nitrite spike time period and have not brought that back up, then you need to be easing it back up to 4-5ppm and in that case some more time may be necessary.
Let us know whether you were back up to 5ppm dosing,
~~waterdrop~~