Over the past 4 months my breast have been kind of sore and my nipples tender. my period has changed from heavy to light and last 1-3 days. test neg.

Ovulation: It sounds like you have some issues with not ovulating, especially if the symptoms are in both breasts. The bleeding may be breakthrough bleeding and not a period. You probably need some provera (medroxyprogesterone) and a work up by a gynecologist including a blood pregnancy test. Some women always have a false negative urine pregnancy test.