Her2 positive and no test

[Patb]

Hi all
I read all the post and am newly diagnosed in June, Stage I, No Nodes, 1.7 centimeter, ER+PR- Her 2 positive+3, Lumpectomy, clean margins. I had four A/C every three weeks, radiation, am taking Arimedex now and have started Herceptin weekly for one year. I have had no test such as cat scan, MRI, pet scan, etc. The only test I have had is two Mugas which were okay. Since I see all these post I wonder if I should ask for test because they just say not needed at this time. I know this is an agressive form of breast cancer and want to do all I can but I am not sure what I need at this point. Any answers from the most informative women and men I have ever met whould be truly appreciated. I don't want to overtest but do want the best treatment.

Thanks
patb