Could be implantation bleeding. I've heard of a lot of people getting BFP on CD9 through the day when AF should arrive.
I too had a temp dip on cd10 but hpt was bfn. Temp continued to stay between 98.2-98.4! I went in on cd14 for my beta got a bfp. I had no spotting after the temp dip but my boobs felt heavier and I started to have more cm since cd14. Wish you luck and hope this month is a bfp for you!
Well, hpt yesterday was bfn and today af came. Which is 5 days earlier than it has been. So, I am just hoping all my hormones and af are just balancing out. Next month will be the month! And congrats to you yang_k23!!