I had my first DS at 28 weeksw, and was told he had like a 80% chance of survival, and that every week after that, the % goes through the roof. A bub at 34 weeks, would not have too many problems at all, just maybe feeding, and a little help breathing at first.
Try not to stress hun, with all mine, i had premature labour, which they stopped, and with my last 2 DS, they went to full term (for a c-section anyway).
Fingers crossed that you go one to full term hun