Darkest OPK ever had, but supp to start period today.

Okay I know this has been posted a lot, women take opk if they don’t have any hpt at home. I did this just because I wanted to start super early and chart an entire cycle, as I havnt before. I was supp to start today and got the darkest line I’ve ever gotton, and months past, I’ve confirmed and had normal testing throughout the mo with peaks. Never been this dark.

My question is how many people have gotton a bfp, after having this dark test.. and also how many people have a big surge right before their periods? I read some people don’t even get the surge high enough to get that dark right before periods. So curious!!