| Hey Cheryl,
Hun, I think you're just fine.
Often you will get an ammonia reading after a new tank has fully cycled because perhaps you fed to much, or cleaned a little to much, or changed filter cartridges, or changed a little to much water, or even cleaned gravel, disease treatments, there are numerous reasons that cause damage to beneficial bacteria.
If you did a disease treatment, it would make sense that you are seeing the effects it had on the cycle a week later.
Keep an eye on it to see if it continues to spike, watch the nitrites too for a rise.
You can add a dose of Cycle and don't do any water changes...
This will help build stronger beneficial bacterial colonies so that less accidents occur with damaging the cycle during regular maintenance
and disease treatments.
Your tank needs about a month after the cycle is complete to really establish itself.
Let me know if you have anymore concerns and I'll be happy to help. | 
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