Is there such a thing as too early to get a mammogram?

Yes: Cancer screening is about the risk/benefit ratio. If you do not have a family history of early breast or ovarian cancer (brca1 or 2 mutations), getting a mammogram in your 20's, for example, could cause more harm than good. Mammograms have a significant false positive rate which means you might undergo a unneeded procedure (biopsy) that could cause you harm (both physically and emotionally).

Yes: According to the American Cancer Society, American College of Radiology, and others, annual screening mammography should begin at age 40. Screening may begin sooner if you are a BRCA carrier or are otherwise at high risk. If you have a lump, a diagnostic mammo could be performed, but in younger women ultrasound is usually the imaging study of first choice.