My cousin had her first at 26weeks and went on to have number2 at 33weeks.
My friend also had her first at 26weeks and her second 10days post dates and was induced. Neither had anything the second time around to prevent the labour early like a cerclage or bed rest etc. My cousin was on nifedipine and bed rest for a week prior to having her son at 33weeks as she was contracting. They managed to hold him in an extra week and get the steroids to work well before he arrived.
It often depends on why you had a prem bub in the first place as to the risk of having another prem.