What does it mean when my bbt drop down at 8dpo?

Means either AF is on the way or implantaion dip.

hi Waiting: as Angela said it could mean either AF or implantation dip, hope this is your month.

Also, don't forget that FertilityTies now has an Ovulation Calendar and Ovulation Chart, you can find it on the navigation bar by clicking on Ovulation, and it's FREE to use. You can also easily just copy and paste it for others to see.

good luck and babydust!

If AF was on her way would my temp rise again after the dip like it did?

i dont think it will rise, it will only rise if you were having implantation dip. If AF comes it will continue to drop...

Is 8dpo too soon for implantation?

no, they say it happens anywhere from 6-10 days after ovulation.