Possible breast cancer.

I’m 30. 10 month PP. I stopped breastfeeding my LO when she was about 4 1/2 months old. I recently got a new GP. I knew I had a lump but I assumed it was from breastfeeding/hormonal issues. So I was told to go get a mammogram and an ultrasound. Today I got a biopsy done. Doctors are leaning more towards cancer... I’m wondering if anyone had some type of benign tumor after having a baby/breast feeding?