It pays to look closely at your credit card statement. You may see a "test charge," - a small charge, like $1. It may seem insignificant but it could be a sign tat a scammer has stolen your credit card and is testing it with a small amount to see if it works. Some merchants legitimately place a test charge on your account appearing to come from gas stations or hotel; these charges eventually drop off. But if you see a small charge and can't identify the merchant, contact your credit card company immediately.