@feasting – My doctor told me that I will need to start getting mammograms when I'm forty. She said that before then, my breast tissue will be too dense for the scan to be useful.
Since it would be hard for anyone to see a spiculated mass on a mammogram of a thirty-year-old, there is an alternative. You can get an ultrasound of your breasts.
You probably only need to do this if you feel a lump or soreness, though. I doubt a doctor would recommend it for no reason.