What is implantation?

I am DPO 10 on Cycle 25. I am due for AF 3 days from now (Thursday) I wiped myself and saw light brown EWCM (stretchy and clear mixed with brown tingles) then it stopped. That only happened in the morning. Now I’m wiping again with pink EWCM. Stretchy, clear with pink tingle very visible. Is this considered IB or AF is on her way?