Cycling a tank

[MitchM]

It could be fine right now, it depends on how cured the live rock was.
If the live rock was taken from a mature tank and immediately put into your new tank you could have very little die off to give you much of an ammonia spike.
It's good you're not in a rush, and whatever the state of the cycle, make sure to add new additions spread over a period of time, not all at once.
Keep testing the water every few days to be sure.
You could try a fishless cycle to make sure that the ammonia gets consumed and that the bacteria colonies are established.