If you have to open a new QBO account, make sure to click the Buy button to get the discounted price for up to 6 months. If you purchase from the trial account, you have to pay the regular price.
Let me get the help you need in identifying the QuickBooks subscription you have.
If your interface looks like this, then, you are using QuickBooks Self-Employed (QBSE). And when you see Subscribe now at the upper left hand, it means that it is under Trial period.
However, when your page is the same on the image below, then you're using QuickBooks Online (QBO). The Subscribe now button will be available if you're under Trial version.