Thoughts on chart?

Hi friends, any and all thoughts on my chart are welcome.

I’m thinking I ovulated CD18, not on CD16 like it says. That coincides with a bbt spike and 48 hours after a LH spike. Thought we timed it correctly this time but I’ve had two bfns, 1 first response on DPO10 and 1 cheap cvs brand today DPO12.

Am I testing too early? Is it still possible? How soon does your temp go down to prepare for af? Does it mean anything that mine is still up?

Baby dust to all.