HELP!!

I had my period 17th-19th October and ovulated 24th-30th October. My boyfriend and I had sex everyday during the fertile window. Tonight when I've got to the toilet I've had very very light pink discharge when I wiped. I've read a lot online and some say you can't get implantation bleeding 10 days before AF but others say you can. Has anyone had this? I don't know what to think!