Hi,
If you have no other symptoms like nipple discharge, skin changes in the breast or nipple area, any lump, any inversion of the
nipple etc,I doubt that it could be a sign of
breast cancer.This
pain could be caused by hormonal changes.Try to avoid caffeine (chocolate coffee,colas) and see how it goes.If the pain still persists you will need to schedule an appointment and see your physician for a clinical evaluation.
Take care and best wishes...