I would like to determine if i was wrongfully terminated from my job and if i have a case for wrongful termination?

On 3/25/13 I was discharged from my job for using hospital electronic medical records to access confidential patient information for personal use. My employer stated this was a direct violation of the facility standards of performance and conduct, as well as a Hippa violation. Previous corrective action related to this incident was none. I was never given a verbal or written reminder nor decision making leave. The patient medical record that I viewed was my husbands. At that time he gave me permission, was my dependant and was under my medical insurance. I only looked at the appointment data in his medical record and my employer has that proof. I asked that my employer notify my husband to ask if he had given me permission to look up the appointment information in his medical record. My employer never contacted my husband. I was a valuable employee, employed there for almost 5 years & didn't have any other form of corrective action notices in my employee file. I am a RN. Case or not?