Period confusion, not normal

Cierra • Hey y`all I`m cierra, 21. We have a 3 year old daughter, Scarlett and another due april 24, 2015
I posted a couple days ago about my period either being menatraul or implantation. Well my period is usually six to seven days with medium bleeding and then it does down to spotting the last two days. Well first day I had medium dark red almost brown, second day same thing but more brown, third day it was brown then went to dark red but turned to spotting, today it's black brown and is mixed with CM . Like a period would be ending. That is so weird because that would only be four days. I had cramping, tender breast like usual but I'm confused. Help lol