Due date calculator help

So my last period was 11/18/2021. My next period was supposed to be 12/25/2021. Nothing happened. I thought I might have been pregnant since it skipped but I took test & they were negative. On 12/31/2021 I had a light brown stringy discharge with a faint pink when I wiped. So I tested again nothing. Then I tested 2 more times spread apart and nothing. So now I’m confused on how far along I am. Any kind advice is appreciated. I can’t tell anyone yet so I need y’all. Thanks.

Thoughts? Thanks again