Purple/Red line ?

Has anyone else heard of the red or purple line theory ? Ive googled some ways to know dialation without checking yourself.. Due to some pains ive been having and last week ii was 2cm dialated and today ii saw the theory that a red or purple line will appear durring/after dialating and when ii checked mine is about half way up my butt... anyone have this to be true ?.... If so id like to call my dr but ii dont want to call sounding stupid😔

(37weeks4days)