Agree with what has been said here already. I was diagnosed with breast cancer at 43 and recommend regular self checks starting in your 30s, and mammograms if you’re able to get one. They aren’t perfect but better than nothing. Ultrasounds and MRIs tend to be more accurate for imaging but unfortunately insurance typically doesn’t cover unless a mammogram finds something first. Early detection is so important because it gives you a runway of time, treatment options and of course may save your life. Google “free or reduced cost mammogram” in your city to see what services are available— some orgs offer free screenings.
I also recommend getting genetic testing done to see if you have any of the genes that make you at higher risk for breast cancer, BRCA 1 and 2 and there are others. The Myriad genetic test screens for 48 different genes across several common cancers. Knowledge is power and we have to advocate for ourselves.