You can get emergency/pregnancy medi-cal or medicade from the state or county and that'll should help you.
Go to your local health department and get signed up through Medicaid
Contact your local human/ social services department. (Welfare) Tell them your pregnant, don't have insurance and need to apply for Medicaid services or whatever equitable program your state happens to call it. Take care.
If you can't get insurance through your employer, try applying for Medicaid.
See if you qualify for state insurance.