Thanks I think my mom had stretch marks, Well if I do get them I hope they don't come till later and not a lot.
Sounds like that is what you have, it can come at any point in pregnancy.
The Linea negra has nothing to do with stretch marks so no it doesn't mean they are soon to follow.
Does your mom have stretch marks from giving birth, do you have sisters? If they have stretch marks it is very likely that you will too. Unfortunately none of those creams or body butters work, it is all in your genes. My belly looks like a tiger from my first pregnancy, stupid genes. I was so mad too cause I didn't get any sm until 8 months so I thought I was one of the lucky ladies and then all of a sudden one bye one they started appearing.