Excited but scared of unknown

31 weeks baby #3 ( got my girl). There at more days now that I am so scared though been through this 2 previous times. Each time was different with pregnancy and labor. This time having more back pain than ever and other pains with a job i sit a move around as much as I would like. Compared to last baby worked retail so never got to sit and was never in this amount of pain or tired. It’s scaring me to what labor will be on one hand want natural and others have a hard labor and need epidural.