I've had 2 preemies born at 26 and 27 weeks and I am now 38 weeks 4 days pregnant with my third. Just take it easy and don't over do anything
I have a friend who had her first son at 33/34 weeks. The doctors couldn't ever determine what caused him to come early (ie. due to infection or something)....so, the next time she was pregnant, her OB told her that it was "unlikely" she'd have another preemie. Lo and behold, he was right: she had her second son at 39 weeks.
I'd speak to your doctor/midwife, but unless you're predisposed to preterm labour or something, I wouldn't think that you'd necessarily have another premature baby.
Good luck :)
My eldest was born at 32 weeks...then with my next child I went into preterm labour which they stopped and then I ended up having to be induced at 41 weeks. My third child was born at almost 42 weeks, induced.