will I get stretch marks 3rd time round?

I was quite lucky with my first and second and didn't get any stretch marks on my stomach just a few on the sides that were really light and faded quite quick.. I'm 31 weeksneoth my third and for some reason I feel like I'm gonna get them so bad this time, I can feel them but can't really see them, will they be more noticable after birth and do they go darker? I dont mind if they stay light like my others