1 day bleed then brown discharge

I was due my period and the day before i was due i had a pink bleed (normally heavy painful periods) but this was normal period with clots and slightly painful. The next day it was just a brown bleed but not much and then after the 2nd day i have had brown bleed only on wiping not enough to require a pad.

I took a pregnancy test which has been negative.

Im usually 6 days heavy period. So this is out of the ordinary.