I've never had a chart like this before

Torie
I am taking my temps at the same time everyday, and it was pretty consistent until shortly before ovulation and now it's so rocky.
​I am suppose to get my period on Saturday, I only have an 11 day LP - and I took a test yesterday at 8dpo it was negative. 
​I don't understand the dip at 6dpo it's not below the cover line so it can't be implantation, right?