Totally Confused...

Alright, so i woke up on the 30th to use it. Wiped, seen pinkish colored blood. Immediately put a pad on. Went to the Mexican restaurant for about 3 hrs. Came home, nothing was there; i wiped and seen the blood changed to a very dark reddish color (close to brown but not brown). Again, i put another pad on for overnight. I woke up (On the 31st) thinking i was flooding but wasn’t because i’m use to flooding everywhere. Only a few spots on it same color as last wipe. Changed that, put another one on. 5 hrs laster, more spots. My cycles are usually heavy to the point i’m wearing a tampon & pad but i didn’t use a tampon because i was off work for the holidays & didn’t mind sitting around with just a pad. Went back to work today, only spots but a darker color reddish than before. Now that i’m home. Its actually brown now. My period usually last 7-8 days. Could this be implantation bleeding? I took a test & it read not pregnant...did i take it too early?