Best insurance companies?

I'm not a U.S citizen and won't be for 5 years! (I am from the U.K) But I have my greencard interview 6th March and should have it in hand a couple weeks after that! I can't currently work, I can when I have my greencard, so I am just wondering if anyone on here knows of any good, affordable insurance plans for pregnancy over here that doesn't involve governmental benefits (I cannot be a 'public charge.')

For my husband to add me to his it boosts up from $40 to $400 and currently, we barely have $200 left after bills 👎🏻

I have no idea how healthcare over here works or what to do if pregnant!! I have a free ultrasound on 20th Feb (I am currently 5w 2 days) but after that I have no idea what to do or where to go 😅