If you notice multiple payments in the same month, there are a few things to check.
When you upgrade to a different plan, your first payment for the new plan is a few days earlier than normal to make up for the new, higher monthly cost. After that, you pay once each month on (or near) the day of the first payment.
Is the charge pending?
Check the status of the payments on your bank statement.
If the payment shows as pending or processing, this is a temporary authorization charge made by your payment provider.
If a regular payment fails, we try to take it again later. You may see both the failed payment and the payment that went through on your bank statement - only one has actually been taken.