pregnancy after c-section/ repeat c-section

So I haven't taken the time to really research the topic, but I wanted to hear some experiences from mamas who have had a previous c-section. I read something briefly about the possibility of a "window" forming on your uterus at the area of a previous incision, where the uterine wall becomes very thin in that area to the point of basically being see-through. I know every woman is at some kind of risk of uterine rupture no matter what number pregnancy or what kind of delivery, but the further along I get, the more I wonder how often this "window" thing happens to previous c-section mamas and the outcomes. Its been 3 years since my first pregnancy/c-section, currently just 15 weeks along with baby #2.