I'm a licensed criminal attorney and I believe I can provide some assistance. Before beginning, please provide some additional details on what took place.
Yes, you certainly could be in trouble here. It's difficult to state what the police will do here, but it seems likely that they will investigate, determine that you had possession of the credit card and made a purchase with that card. If so, this constitutes theft.
In Florida, due to the relatively low amount, you would likely be charged with a misdemeanor theft. Assuming you have little to no criminal history, the "worst case" result is probably probation and fines. If the prosecutor is reasonable, you may be able to o even better than that.
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