Scared of the actual birth

So I am 30 weeks pregnant and loving it, but I can feel the anxiety of labor creeping up on me. I am trying to calm myself down by being positive and stuff, but sometimes I get really freaked out about what if I don't survive it? My doctors great and so is my support system (husband, parents, inlaws, siblings, friends) but sometimes it's a scary feeling that's difficult to shake off. Is it just me who's going berserk with this?