TMI PIC. on day 5 of my period and this is all that I've been having???

My period was due to start Monday which it did. But It's been VERY light and only see it when I wipe. It was a red color Monday and ever since then it's been a redish brown color and now brown. On tuesday there was one small blood clot when i wiped but that was it. Usually my period would be medium and then heavy 1 day and then go light. But this week it hasn't filled a pad at all! I took a pregnancy test but it was negative. My boobs have felt a little tender today. And there hasn't been any cramping at all. Anyone have a similar experience??? Or any thoughts?