Very light period

Hi all,

I got a very light period on friday so i counted myself out then noticed the flow wasnot as much for my CD1, the color looked normal with clots, then CD2 i bearly had bleeding, last night my pad was clean and all day today i hv lil brown discharge. All these are unsual for me cos my af lasts for 6 days and 4 days of normal bleeding and 2 days of brown. I took a test mid day it neg. Do i hv to wait few days to see if this was not my period or should i take another test tomorrow with fmu. What do u think? Thank y all