Hello and welcome to Apple Support Communities GinaN253,
I see that you have some questions about Apple Music and the 3 month trial period. I'd be happy to provide some information to answer your questions.
The first 3 months of a new Apple Music subscription are free. After that you would be billed monthly according to which type of subscription you choose. If you do not want to keep the subscription after the 3 months, you'll want to cancel the subscription at least 24 hrs before the renewal date. The following article provides some more information about viewing, changing or canceling subscriptions.
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Have a great day!