My breast normally hurt before period but this month they hurt for a week and then didn't hurt and period still hasn't came, negative pregnancy test. ?

Delayed period: Premenstrual breast pain and delayed period. There are strategies to help you deal with breast tenderness in the premenstrual syndrome. I believe your real question is that you have a delayed period, and you want to know why because pregnancy test negative. First of all, repeat the test after a week if pregnancy possible. Also, several other causes of delayed period: http://tinyurl.com/gp8o5wn