Spotting or have my periods come early?

Natacha
Firstly I am actively TTC.
So my periods are due in 6 days, yesterday I had what I thought was spotting (getting my hopes up thinking yes this is it!)
But today it's gotten a bit heavier and slightly changed colour.
Is it possible my periods have come early? 
Or could it still be "spotting"? 
Any advice or knowledge on this would be greatly appreciated . 💗