Baby after preemie

Anne 💙💙💙 • Mom to 3 boys. August 2015, December 2016, December 2018
Just got my BFP for baby 2 today! Super happy but terrified. My son was born at 29 weeks. Anyone else have a normal pregnancy after a preemie? They have no idea why I delivered so early. They think it was an infection in my placenta but they were not sure.