If there is concern after the mammogram, you may have an ultrasound for them to see things more clearly.
This site is for support, and we can tell you our experiences and help you along the way. I would stay off the internet looking for answers about what "could" be going on. Too much misinformation or wrong information. At least on this site, we have ALL been through breast cancer. Even if you are diagnosed with BC, it is very survivable.
It's not uncommon to have lumpy breasts and not have breast cancer.
Please let us know what you find out.
Prayers and HUGS.