Hi @dbelle, sorry you are going through this. It must be stressful for you.
I think any changes in a lump need investigation so it's good you are doing that. You could try to see if there are any cancellations to get your mammogram and ultrasound earlier.
Good to to check in with surgeon too on the last scan. I would also suggest if you aren't having your scans done at the same place as 4 months ago that you bring them with you so a comparison can be made.
Wishing you all the best for a good result.