Spotting Period

Tawnee
I am having some weird spotting, been going on for 2 days. 
It started as a very light Brown when I wiped, and now it is very light pink. Today it has gone to a very light pink with some small poka dots of a darker pink. And there is a ton of mucus when I wipe. Just wearing a panty liner and it has only left the poka dots on it. No heavy blood or anything. 
My period is not due for another 8 days and I was a week late with my last period. And now I'm bleeding early! I had unprotected sex on the 3 top fertility days that my calendar says they were on, but I feel like it would be pretty early for it to be pregnancy spotting from that. 
Oh and I am having very slight cramping, nothing major. 
Has anyone had anything like this that can help me out?