Do I need to unsubscribe after buying standard edition for SWTOR?

I recently began playing star wars the old republic and bought the standard edition via origin which gave me a 30-day subscription among other things. I was wondering whether or not I need to unsubscribe from this? It says "Your account will move to Free-to-Play status if you cancel your subscription and your paid game time runs out."  I have not connected any credit card to the game or anything like that, and I just want to make sure I don't get billed later on the 30-day subscriptions ends. 

Thanks in advance 🙂