Recurrent PPROM

Hello, I'm 31 and have a 2 year old son who arrived 8 weeks early. Luckily, he only needed 3 weeks in the NICU before coming home and though he measures small for height and weight, has nonetheless caught up in every other way and is a happy, healthy child.
​My husband and I are planning to start trying again shortly for #2 but I'm quite concerned about another premature rupture and subsequent premature birth. 
​I don't smoke, I have a normal BMI, am not prone to UTIs or infections. The only other risk factor is obvs my previous PPROM.
​What is your experience of subsequent pregnancies having had a previous premature baby/PPROM before 32 weeks?