Just to clarify linea nigra is the darker line that shows up on your belly, it usually corresponds with the height of your uterus. Anyways...My linea nigra showed up about 20 weeks when I was pregnant with my 2 boys. I never got it during my pregnancy with my daughter. I am almost 24 weeks and team green. But, I haven't seen the linea nigra appear. I was wondering if anyone else noticed a correlation between the linea nigra and being pregnant with boys. I've never heard this theory before...just curious. It may just be my body and how my hormones respond as I age. My 1st pregnancy was 8 years ago, and the 2nd 5 years ago. (My boys were my 1st two pregnancies).