Temp drop at 12DPO, help

Samantha

I’m still so new to BBT. This is my first month temping. Confirmed ovulation. Implantation dip detected which I know isn’t a guarantee- i had spotting at 8dpo. I tested last night at 11dpo- it was a 6 hour hold with minimal liquid intake and it was a BFN. This morning my temp took a big drop. Past two nights i’ve not slept well, but i’ve had over 3 hours and i know that can play a factor but i’m not trying to be naïve either. . Am i totally out? What’s been y’all’s experience of opinions. Any insight would be appreciated.