What Causes Breast Pain And An Abnormal Period With Bleeding?

I have been having breast pain for two weeks now. My period was two days late. Which is not normal for me. My menstrual blood is a bright red orange which is also isn't normal for me.its usually dark red. My period typically last 3 days. I've started to bleed yesterday but it went away and now I'm bleeding today..I've taken pregnancy test all which came out negative. So what's wrong with me?