So many questions about labor!!

Ok so I’m all set for my baby. My biggest concern is when labor begins. Say I’m at home and i can feel the pain beginning (contractions, water breaking, etc). Do I call the hospital first?

How do you stay calm in this moment? How do you stay calm on the drive to the hospital? I’m so scared of the drive because I’m worried my hubby will totally freak out on the way there.