You may notice that dark line
forming from your belly button downward now (the linea
nigra) and even have more hair growth on your belly or breasts.
Why: During pregnancy, most women will experience hyper - pigmentation, such as a linea
nigra (the line that runs down your belly) or melasma (darker pigmentation on your face) in some
form, both of which are caused by an increase in estrogen, experts believe.