Hi Kate,
You're definitely not alone I was just saying to DH yesterday that I'm going to have a really hard time saying goodbye to my 2 yr old daughter when I have to go to the hospital because I'm worried something might happen. He reassures me but I remember feeling exactly the same way when I was booked in for my c-section with her. We have amazing modern medicine but things still go wrong all the time so it's always going to be scary. Not long to go now, I'm sure we'll be fine.