Purple line dilation

So I just found out today that you can check at home how dilated you are based on what’s called a “purple line” coming up between your butt cheeks. First thought it was a old wives tale but it’s legit. About 90% of women will have this. How to measure is starting from rectum to the tip of the purple line in cm. 3rd baby, I’m 33 weeks and change and looks like I’m a 4-6cm which is pretty on point for me at this stage. (I walked around 6cm dilated for 6 weeks with my 1st and 5cm dilated for about 3 weeks with my second)

Thought you ladies would like to know this as well!