linea negra at 4 weeks?

is it possible to have a dark line in my pelvic area so early if i am pregnant…i dont think i am ..i had a period almost 4 weeks ago &im about due..could this linea negra be a sign of pregnancy..i cant remember in my other 2 pregnancies if i got it this early,because i havent been pegnant in 8 years..is it possible it can show earlier if youve had previous pregnancies? can anyone relate to this?