Dry firing a bow can damage the bow and hurt you. If you already dry fired it, and you are asking this question, then the string probably did not break and it did not do some serious damage to your arm or body. Now, the bow may have been damages, so i would inspect it thoroughly. A bow should not be dry fired, it is too much force for the bow to take, and the string can break.
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Have a professional take a look at it. It might not look bad but once you draw it limbs could snap or your cam could be bent and cause a cam derailment.