Could this be an implantation dip?

Kellie
Hi guys I was just wondering if you think this could be an implantation dip? I got a positive opk on cd11 (not sure how true it is as I have polycystic ovaries) then cd14&15 I had some pink spotting here and there then cd16 I had a tiny bit of brown sticky cm/spotting (only twice) and then this morning cd18 (apparently 6dpo) my temp has dropped right down..