Focus on the positive that tests are negative and at least they've keeping a watchful eye on you @pjs05. Better to have peace of mind especially since dense breats are high risk for bc.
Pre BC I had annual mammogram, ultrasound, biopsies and mri's. Eventually found early bc. I had the same regime for 3 yrs post treatment in 2020. Now I have mets in bones so there are even more bc tests, scans etc. Before they found the bone mets my oncologist ordered mri's every 2 months on a fracture I had in my spine. The fracture occurred in Jan but the cancer didn't show up until July. They found my bone mets quickly and while no cure, at least I was monitored closely and I could start treatment quickly.
Keep busy till the rest. Good luck