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...