What did your CM look like before BFP?

So I'm 12dpo today. A little discouraged because I've had all the symptoms this past week that made me feel strongly that I was pregnant - even the metallic taste in the back of my throat! And as of the past 3 days... all negative tests.

Used first response too. Today I notice I have increased CM... looks like lots of EWCM and sort of a yellow tint to the color. My period is due tomorrow-ish as it'll be 28 days since my last.

Anyone know if this CM change can be a good thing? Or do you have any similar experiences with negative tests on 12 DPO?