Question about brain mets?

Hi everyone,
I have been educating myself on brain tumors as I await my brain mri next week for my dizzines. I was diaognosed 21/2 years ago and have been NED since my surgery. I had my tumor markers done this week and they all came back very normal. When BC progesses can it go directly to the brain or does it usually go throughout other parts of your body first? I know tumor markers are not that reliable so I am not weighing heavily on those. I had talked to a nurse yesterday and she made the comment that Brain mets are not the usual progression for BC, but I also know with her2 pos cancer it seems to be very common. Any insight would be great? Thankyou again!!