Mums in USA - Need help/advice

Hi mums in USA, california perhaps. (Orange county) 
I'm gonna give birth end of October and i was wondering if anyone could help me with an advice or experience. 
I have no income at all. Do i still need to pay for the hospital? Or are there ways to go and prove them that i have no income? 
Incase they don't accept, how much usually will it cost? 
Thank you in advance for your reply.