Yay dinky! That is so good that your temp went back up! I really hope it is a implantation dip for you. Have you had a dip like that in previous months? I wouldn't worry about the BFN, if it was implantation I have read that it takes 2 to 3 days after to get a positive HPT. Here is my test from this morning, 9 DPO, FMU. I think I see a shadow of a line that was for sure not there yesterday but I won't trust anything until it is nice and dark!