hi is the darker line up the front/middle? you get a darker line like this and this is normal... i think it is called linea nigra (i might have spelled it wrong) it is usually right up the front tho so if what you have is different then maybe its something else...i dont have it yet this time, but i did get it last time and cant remenber how many weeks i was when i first got it.....pregnancy does change your skin pigment tho, so prob nothing to worry about, but if you are worried ask your midwofe x