A plumbing question -- water trap?

I have a new house (a little over a year old) and the master bath toilet concerns me. When someone sits on the toilet there is the sound of water dripping behind the wall (where the pipes are). At first I was the only one who could hear it. Now it is louder and others can hear it too. I had the builder get... show more I have a new house (a little over a year old) and the master bath toilet concerns me.
When someone sits on the toilet there is the sound of water dripping behind the wall (where the pipes are). At first I was the only one who could hear it. Now it is louder and others can hear it too. I had the builder get someone to check it -- they said it was water from the trap. No leaks, nothing is loose. Should I call in my own plumber or am I worrying unnecessarily? Thanks for any advice.
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