I am sure I signed up for a premium membership, but I keep getting "8 days remening on your free trail....)
I can not find a page where it shows my account status
Are you using the Trello app? If so, it doesn't include the billing options. You would have to use Trello on the web.
This is a great tool to show you how to find it...
https://www.iorad.com/player/2117600/Trello---How-to-view-billing-history-#_
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