Cd26 with a 29 day cycle.

So I got a +opk on cd 15. I have been having a 29 day cycle and so last night cd 26 I check my cervix and when I cleaned my finger to see cm there is a little pink. Today cd 27 I checked to see if it's getting heavier or darker and it isnt just feeling really wet.. nothing on tp or underwear. I am not having any other symptoms have til Tues to start af. Could it be implantation or just a slow start til af? Anyone have anything going like this happen with good result?