I have just recently started having breast tenderness shortly before my period starts. this time, i've had very bad breast tenderness all week.normal?

Fibrocystic breasts: You may have developed fibrocystic breasts which become engorged prior to your menstrual onset but may also become inflammed which is more painful. The condition is called cystic adenitis, and may be eased by taking advil (ibuprofen).

It can be: With falling hormone levels just before the period preceded by a rise in estrogen, breast tenderness can be normal.