agile – Which software development model can this be called?

I am learning software development. I recently developed a doctor appointment application with a group, it took us 3-4 months, but my group did not follow any specific model. We had a basic idea of our application’s functionality, so we first developed the different phases of the application allowing us to just register patients and users, then we added the appointing functionality. Then we added other features with time, like being able to view the doctor’s profile and patient’s profile, recent doctors contacted by the patient, search functionality. In the end we made the documents.

which model can we call it? Can it be called Agile?

Kindly help me out.