Starting to feel anxious...

I've been calm and relaxed through the whole pregnancy and now at almost 26 weeks I'm completely losing the calm. With my first son he was born at 34 weeks due to preeclampsia which was detected at 30 weeks. As I get closer to 30 weeks I'm feeling so nervous😢 Not wanting to leave another baby in the NICU. Are any other mommies going through this fear? What do you do to relax?