At the moment only Go+ subscription status is available on the mobile app - Pro and Pro Unlimited plan status is not displayed and can be checked only on the desktop version.
Using a computer, log in to your account and visit soundcloud.com/you/subscriptions
If your plan status EXPIRES, you will not be charged again in the future.
Alternately, if your plan status RENEWS, you have not yet cancelled your plan and will be charged at the next payment date.
Please click the "Edit" button as shown above to manage your current subscription.