Well... who knows what shit the authorities will pull.
But... Clomid is not scheduled so as long as it is a personal supply you have done nothing illegal. It is prescription, but you are allowed to import a personal supply.
It is odd they thought it was AS... they must have been watching packages from the senders address. I assume you got it through a source that also sells AAS?
You should be okay.. I don't see how they can charge you or get a warrant for importing a non-scheduled drug. That is perfectly legal.