Do i need to give contacts again after I update my mesh once i have performed initial FEA analysis

I did setup and ran FEA model which is having a number of contacts.
After that i just want to re mesh all the model with fine mesh to see more actual stress results.
But now my mesh is updated.
So now why i have to again give contacts, which is causing a very much time consumption.
This issue was not in the Ansys, there we  can do anything with mesh, but contacts and other boundary conditions do not change there.