Slap bang, right in the middle of your belly

The belly line aka the LINEA NIGRA- what a name for it. But what is it? Do we all get it? Will it go away? That visibly darker vertical line which has appeared is making you question all things pregnancy! 'The joys of pregnancy' I hear you say... It's right, slap bang in the middle of your belly, right over your bump, probably made a left turn at the rounda...I mean your belly button and it seems like it goes on foreverrrrr. Yeah, THAT dark vertical line. It appears on around