Solved! Go to Solution.
Hi there @MusicIsLife! Welcome to the Spotify Community!
You don't need to worry about being automatically charged. Since you didn't input any information to begin with when you started using Spotify, you will not be billed for anything.
I hope you do take advantage of the 30 day free trial, this trial does require you to submit credit card information so the subscription can be renewed after thirty days so you can continue enjoying Spotify Premium without any interruptions.