Purchased giftcard and bought film but haven't been charged?

Hello 🙂

Basically... Last night I entered a giftcard code I recently received from apple, all went through at had £15 on my Itunes. Last night I made a purchase of a film. This morning I checked and I still had the remaining credit of 15 pounds, my email informed me I have been build and my bank account still says I have the same balance that previously had so I know i haven't been charged. I don't know what to do exactly because I don't want to do anything else before this issue is cleared up 🙂