13dpo BFN but BBT higher

Jo

Hey. Around 12dpo my temp starts to drop and on 13dpo -14dpo AF comes.

To my surprise yesterday and today my temps remained high (today even higher than ever) but I got on 11 dpo and today a bfn. Can anyone relate. I’ll wait until 16dpo as in “Taking charge of your fertility” to test again if the temps are still high. You can see my chart below. Can anyone relate? Or has this and ended up prego?