My Cycle Was Due On The 11/16/15. I Started Spotting

My cycle was due on the 11/16/15. I started spotting bright pink with very light cramps on the 11/12/13. The spotting turned reddish brown on 11/13/15 and was enough to fill a pad. On 11/14/15 the spotting was very light and it stopped for a little while on 11/15/15 and it start again. Today is the day my period was due and it has not started. Instead I have a brown discharge. I am not sure if this is my cycle or something else. I took 3 home pregnancy test and they were all negative.