Implantation bleeding?

How long after sex does implantation bleeding start? The last day of my last period was March 6th. Which was exactly two weeks ago today.

I have been having EWCM for the last two and a half days. Today I felt more wet down there then normal. I just went to the washroom and when I wiped I noticed a very light pink color discharge, it almost wasn't noticeable it was so light. Could this be implantation bleeding?