BBT spike but negative OPKs? Help!

Lauren

I’m so confused! My bbt spiked this morning (CD 16). I usually ovulate around CD20 so this would be super early. I’ve also been doing OPKs every day sometimes twice a day and they’ve all been negative (clear blue advanced said high starting CD14 but no solid smiley face). Did I ovulate and just miss it somehow or is this just some weird temp blip. Please help!