Help please

Real
So here we go my normal is a 3-4 day period. So I just got mine November 1 and for the first day it was very dark almost black brown looking disharge and then it let up and woke up the next day with blood and a some small clots then as the day went on it got lighter. So I woke up day 3 to brown discharge again no smell or anything like that but it was only noticeable when I wiped myself like none on the pad. So yesterday day 4 nothing but today I had a little light pink discharge with small lower cramps. Now I have taken a test but it was negative so I'm not sure what's happening so I need a little advice