4 days into cycle need help


Reefing newb
my ammonia seems to be at 0
Salinity 1.026
Ph 8.4
Nitrite .5
Nitrate 20-100

I added bio spira the first day I filled it and I added a live rock two days after I filled it Saturday 7-29 and tested today with a Red Sea kit I used instant ocean salt is there a chance my test kit could be old and no good? I bought the tank and equipment used and I don't know how old the test kit was any assistance would be helpful I'm going to buy a new test kit and retest