Yes, the monthly & annual subscriptions are setup to auto renew at the end of the billing period. You may cancel this auto renew and your membership anytime by going to the "Billing" section inside your membership and click/tap "Cancel Subscription."
If you choose to cancel, you will still have complete access to the membership until the end of your subscription period. If you accidentally canceled your membership or have changed your mind and would like to continue your to be billed for your subscription, go to "Billing" and click/tap "Uncancel."
NOTE: There are no refunds given for billed charges, like any subscription or membership, you are required to cancel prior to your renewal date