Linea nigra... Boy or girl?

Brooke
So yesterday I noticed my linea nigra has appeared. I was googling it for my husband and it said if the line goes from your pubic bone to your belly button it's a girl and if it goes further it's a boy. Just curious if this is true for anyone who has one and knows the sex of their baby? We are keeping our baby a surprise but I love seeing what the wives tales say!