If you signed up for a free trial, there will be no charge until the trial is over.
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Some customers might see $1 USD (or the equivalent in your currency) temporary pre-authorization. This is not a charge. This pre-authorization will disappear in a few days.

A pre-authorization is a temporary hold on a credit / debit card and you are not responsible for paying for it. 

The hold is an action of your credit card company, and we have no control over whether your credit card issuer decides to use this process. The charge will drop off your card within 5-10 business days. The exact timeframe varies with each card issuer and each card issuer has control over when those charges will be dropped or voided.