Chances of baby being ok at 34 weeks?

OK, i know this sounds paranoid because according to my doctors everything about my baby is perfect, but i worry any ways, if my daughter was to be born at 34 weeks would she be ok? how long would she stay in nicu? how developed would her lungs be? about how much would she weigh? (i know that this depends on many factors but i want opinions or experiences with this, im worrying about it too much i know)