This might be your lena negra (the dark line that runs down through your stomach). Your belly button won't be black (like rotten??) unless you don't clean it :). This Lena Negra (sorry- i'm spelling it wrong) will probably get darker and will also last for a while after you have your baby. I had mine for a few months until it totally vanished.
at 11:58 PM on Oct. 17, 2008