Anyone pregnant with their first who get excited at times but scared at times for birth and life after?

Some days are super good where I feel SO excited to finally have my baby girl here but others I get very bad anxiety realizing I have to push this whole human out of me along with life changing afterwards, I’ve helped raise my nephew with his mom since he was born and partial custody but with my own it’s different! I’m so nervous for birth and I used to be SO confident about it, I wanted natural route but as time goes nervousness kicks in. Some days being so nervous for her being here takes over feeling excited and makes it hard to fully feel excited, I begin to feel bad to feel this way. Can any other mommy relate? Or give some good first time mommy advice?