Thoughts?...

I peed on a sticky last Friday (feb 27) Negitive. My boobs have been hurting non stop, but they normally do before I get my period. Started spotting tuesday. And my boobs still hurt; But I still took a test anyway; Negitive. My period was suppose to come thursday (March 5) Haven't really gotten it just the brown stuff, no real blood. My boobs hurt but not nearly as bad. My back hurts. Should I take another test?