Brown thin line around neck... expecting boy baby??

February

Hi all, I am 27 weeks pregnant. From past 2 days, I am seeing a brown line( kinda like the linea nigra over stomach) over my neck. Today I can see one more thin dark line high up my neck.

Is this normal during pregnancy and how to cure it? I have heard old wife tales saying this happens when it's a baby boy inside. Anyone have birth to a baby girl??? I would love to have a baby girl...though I am fine with a boy too. :)