Free trial is not free

That is just an authorization hold, it's common now with most online merchants when transacting with them for tbe first time for security reasons. They do it to ensure the card and your info is all valid. After a certain period of time (Usually within 7 days) they release the money back into your account. 

In My banking app (Chime) those authorization charges are shown with the status *Pending* the whole time, not sure if yours does the same but I'd check the payment description and see if something similar is there