I had it with my first pregnancy 9 years ago...and I have also had a tummy tuck since then (clearly this was not exactly planned lol) so I am interested to see if it makes an appearance this time! From what I remember I think it shows up more around the half way mark.
I did not have it with my first. With my second it didn't show up until around week 30 when my belly was really growing. It didn't completely fade for about 6 months pp.
I don't know if this counts but I also got VERY hairy along that line lol lots of little black hairs. They're gone now but DH made fun of me for it a lot!
According to The Ovia app, the Linea Nigra can start showing up around 11 weeks (for some reason this is one of the articles they pushed for me this week). Nothing for me, but my nipples haven't changed shape or color yet either.
I did have one with DS, but I don't remember when it showed up. I don't think it was until 3rd tri for me, and as a PP mentioned, it didn't really fade until around 5-6m PP.
I'm a FTM, have a medium skin tone and I JUST noticed it today, because I shaved down there last night (sorry tmi). It's not super dark but definitely noticeable and goes just below my belly button. Honestly I've always sort of had it very lightly though (probably because of my skin tone) but it's definitely more noticeable already.. I'll be 12 weeks on Friday!
I think I may already have it! I am 12 weeks 4 days and noticed a faint line from right below my belly button and down. I read it usually doesn't affect fair skinned women, and I am about as pale as they come.
Re: Linea Nigra
DS2: EDD- 09.08.17
Me: 34 | DH: 31
Married: Nov. 7, 2015
TTC Since: February, 2016
BFP: December 20, 2016