Taf/mek adjuvant therapy scan question

I have been on Taf/mek combo for just over a month. Stage 3a melanoma that was resectable. Original scans were clean. At my first follow up since the pills I had my lab work done and set up for a EKG but when I asked about having scans I was told because I wasn’t metastatic that they wouldn’t do any ct, pet or mris again unless I show symptoms of a problem…my oncologist said if I was interferon they wouldn’t be doing scans either. He said they don’t like to as there can be false positives. Does this sound right. I could’ve sworn they said every three months and ultrasounds of under my arm where the one lymph node affected was found but no mention of that either. This seems reckless but I don’t know. Again a second derm I’ve seen has tried booking me for a year from now when in office she said every three months as well. I’ll be pushing back on that tho because in the booklet for taf/mek it says skin checks every two months. And these are highly recommended people here in Ontario.