Hi
Finally managed to come back and have a look at your chart. Lovely recovery after that temp drop on 8DPO, you are still a bit early to start testing, but if it was implantation you would 'possibly' be able to start testing around 11/12 DPO, but saying that dont get too dissappointed if it is a BFN as you dont know your LP.

As for the temp drop, it really depends. Some women have a slow decrease in temps a few days leading up to AF, others have a huge drop the day before or the day of AF.

HTH
I'll be stalking your chart.