Linea nigra....

So I noticed something this morning getting dressed:
I saw that darker line going down from my bellybutton down to my pubic bone. ( well it ended in the jeans ) haha.

I was surprised to see it already?! I didn't know that it can show up so early. I suppose it is because I already have a bit darker skin.

Here are some information I found:

Linea Nigra
That vertical line on your belly is a pregnancy trademark that shows up on moms-to-be of all stripes.
What it is: The dark vertical line that often appears between the belly button and the pubic area.

What causes linea nigra: Hormones, which are also responsible for your newly darkened areolas and freckles as well as an impressive variety of other skin anomalies, are behind this weird little stripe — which you've earned just by becoming pregnant.

What you need to know about it: Your baby is completely cozy and content inside your belly, but there's some wacky stuff going on outside. One especially noticeable oddity is that dark line running down the center of your tummy, from just under your belly button to your pubic area. This linea nigra — literally, the "dark line" — is likely to be more pronounced if you have darker skin, but never fear: It fades a few months after your baby is born.