Scar tissue or possibly fat necrosis?

Hi all, I'm a first timer here. For background, I started getting ultrasounds in my early 20's to watch a lump for changes/growth which eventually went away with no more concerns after a year and a half or so. Fast forward to 2017 I had a lumpectomy on my left breast to remove a lump that was a fibroadenoma which was quite bothersome. Pathology did not show anything abnormal.

A year and a half ago another lump that was just guessed to be a cyst popped up but eventually went away on it's own.

Fast forward again to a few weeks ago, I started experiencing constant pain in my left breast as well as my nipple. While examining myself I realized that an area at the bottom and left of my breast is harder and thicker than usual (in the inside as opposed to the skin) as well as a similar spot under the nipple. I also found a strange possible lump in my armpit that is painless. My doctor got me in pretty quick and has set me up with an ultrasound and possible mammogram at the hospital for Weds morning. She said she felt everything I had explained to her which made me feel a little less crazy because I can get pretty paranoid sometimes.

I am very aware (especially at my age of 34) that even with the small family history of bc that this is most likely something benign. What I was wondering is could this be something like scar tissue from 2017 or fat necrosis? Has anyone ever had a similar diagnosis that includes pain? I know I'll find out soon enough but I guess it just helps to think about all of the benign things that it could be rather than the worst things if that makes sense.

Thanks to anyone who gets through this novel! I feel better just typing it out really....