Having slight breast tenderness 4 days after my period? have never had sex. my period was 6 days late and lasted 6 days. what could cause this?

Pregnant? : If "never had sex" means just not having intercourse, but having genital contact with a male who may have ejaculated outside the vagina, pregnancy is possible. A "late period" is unusual at "age 24", but can occur with increased stress. Get a serum HCG test to be certain about pregnancy in another week. Breast tenderness can be related to increased estrogen from the delayed onset of period.