Dear TruTexan,
Breathe deep.Friday is a long way off for someone going through the "Oh my gosh what does this mean"...
Drink lottsa water, and stay hydrated. Before your re-visit,Don't wear any deodorant, any cream, etc. , even though you may feel stinky, they don't want aluminum, talc, glitter, by-products junking up your mammo.
Millions of mammograms done annually for screening are done.
Occasionally something looks "different". Not really "suspicious" of anything.
A mammogram takes your pyramid shape (triangle ~sort of

and tries to squeeze it into a rectangular shape..,
Sometimes a normal area may be peeking at the Doc head on, like looking in a pipe directly, versus along the length of it.
An area that was once appearing one way can have absolutely norma calcifications with it, thus , they want to squish you around and look at it from another angle.
Maybe even take an ultrasound, just rubbing gooey stuff on it and letting sound waves bounce back for a wiggly image, to see if it is just a normal ole'cyst, which many of us have and never know it.
Data shows thousands of breast cancer biopsies come back negative.
So, if you think about it , we have some things that we may need to go through that scare the hello out of us, and we know others that have been there ahead of us.
Come back and let us know...