The reason ruptures tend to happen during labor is because contractions can cause the c-section scar to split open. In this case, the risks of vaginal birth after cesarean are explained to the expecting mother. She is often automatically scheduled for a c-section if she’s had two or more previous C-sections, a classical C-section, or a previous rupture. That’s because the rupture risk is high with these factors. The scheduled repeat cesarean delivery may happen early because the risk is high.