Im 28 too so know how u feel, bodys completely changed. My marks are all on bottom of my bump & hips, hope dont get more. I put on bio oil religiously every day but to be honest i think it just depends on skin type. Try not to stress about it, our bodies have to go through alot before our beautiful babies get here, will be worth it. plus im sure ur oh doesnt care or see u differently because of them, so dont be embarassed by them x