Needs preemie advice!

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My water ruptured at 33 weeks 1 day. I was not aware of it until 2 days later. I’m now admitted in the hospital feeling scared and stressed. I had the EASIEST most uncomplicated pregnancy ever and I never imagined going through this. They are hoping he stays put until week 35.. how long did your preemies from week 33- 35 have to stay in the NICU if at all?! Any advise to calm my nerves? What are their survival rates?!