confused....!! help appreciated

So I was due my period on today but instead had some bleeding on Monday (light pink spotting, got heavier in the afternoon but nothing like AF). Nothing all day Tuesday, light pink discharge on Wednesday and a kind of beige /peach discharge today, streaks of very light pink through discharge. Took a test and was negative. No sign of any other bleeding! Overly sensitive nipples, headaches. 

What do people think about this?