Your first charge covers the one-week paid trial. After that week, your subscription automatically renews with weekly payments unless you cancel before renewal.
The trial and weekly renewal amounts vary by country. Compare the charge with the prices shown on your payment screen when you subscribed, your receipt and your subscription details.
Check the next payment date with the store or website that billed you. If a charge does not match your records, contact support or the billing provider with the date, amount and order ID.