Help im unsure if i could be spotting??

I have had thick stretchy CM for a few days, and my periods due sunday. BUT i started spotting today which NEVER happens before my periods.

WELL when i first whipped it was brown for a bit, then it got pinkish & reddish but not too red, and it has had alot of vaginal discharge in it as well. I ovulated 12 days ago from today. And hubby and i did the deed that day as well, and no other day after it. Could it possibly be implantation bleeding?