Could It Have Cycled? ??

[SCHMUSTIN]

I have had my tank running for about 3 weeks now and have had live rock in and a deli shrimp since the start. It's a 55 gal with 53 lb of live rock. The rock is awesome and came with lots of hitch hikers feather dusters and coraline alge.

I have a 100 gal skimmer along with a Aqua Clear110. filter and have good new age growth on the rocks as well as the sand.

PH is 8.2
SG is 1.025 to 1.026
Nitrates 0
Nitrites 0
Amonnia 0
Temp 78F

It ran for about 9 days before I started testing it cause I did not have a kit. I have been testing every day to every other day and all test are showing up perfect.

Is it possible that the tank could have cycled and I didn't even know it?