A cousin of my Dad's had PE in her first pregnancy in the 1960s. It was not that early onset, maybe about a month early, but sadly the baby died (stillborn I think). She had three early miscarriages after that, and then adopted. She had kidney disease and hypertension, and might have gone on trying but for her health problems, and the trauma of 4 pregnancy losses in a short space of time.
My husband's mother was born a month early herself (induced), we think due to PE. That was his grandmother's fifth and last pregnancy, although obviously by then she was getting older (38). They were a catholic family, but may have taken precautions after that problem.
This is probably not what you wanted to hear, but I think the statistics still suggest that for most women PE is at its most severe in a first pregnancy.