BBT Chart Help?!

Nikki

Guys, what is going on with my temps?! Got a positive OPK on the 8th, temps dropped like crazy, and I barely have a rise as of 6/12. Isn’t four days after a positive OPK a long time for ovulation? Maybe i didn’t ovulate this round? Hoping for a big spike tomorrow but this seems a little odd! I’m using the Ava bracelet but starting to think the temping mechanism is faulty.