We ship your subscription according to your desired shipping schedule, so if you haven't seen your shipment yet it's normally due to a credit card processing issue. If your card has changed, expired or over its limit your order would not have processed.
To fix the problem, go to the Manage Subscription page in the my account section of the website. Once there, you can update your credit card number to resume the subscription. If you don't receive an email confirmation of your order within 24 hours, please contact us and we can fix the problem for you.
Read more about managing your subscription here