Strange temp spike?

Chrissy

So 5dpo i had a tiny temp dip but then on 6dpo i had a big temp spike. Has anyone else had this before? I have never seen this on any of my other charts. Super small one sure but not this big of a jump. And now my temps are staying up there. Possibly a good sign? Idk. What do you ladies think? Never seen it do this before. 8dpo today. With my luck is probably just a weird fluke.