Follow-up scans

I have stage 4 breast cancer, and started treatment of Palbociclib, Letrozole, Adcal-D3 and Denosumab injection at the beginning of March 2020.

I thought I would be having a scan to plot progress, (if any), when I have my monthly review with my oncologist, but nothing yet.

Has anybody else on here had monthly scans? Or can advise regarding scan frequency.

Thanks