There's a few ways in which you can check whether you have a subscription. The easiest way to do this is to log on to your account. Once you've logged in, you'll either see the heading Current Subscriptions, or you'll see a green box which says Already have a case? Start a subscription now. If you see the former, then you have a subscription. If you see the green box, there's no subscription under the account you're currently on.
If you have ordered a Starter Pack (Subscribe & Save) for £12, it's likely that you will have a subscription. If you don't want this, you can cancel at any time - you can find out how to do this with this Help article, or get in touch with us!