Yes, your credit score may change. First of all, when you apply for a credit card, an issuer will make a hard pull to see your credit report(s). Once you are approved, a new credit account will appear on your credit reports. This will shorten your overall credit history, increase your overall available credit, and lower you overall debt-to-credit ratio. All these things will cause a positive or negative change to your credit score. If you are not approved, your credit score won’t change at all or will slightly change. However, too many hard inquiries may cause a noticeable drop of your credit score.