Look, how can you be this naive?

You've met for the first time, but never bothered to actually sit down together and discuss what would happen in case of a pregnancy (which is very likely if you don't use any form of bc). Furthermore, you should have also discussed condoms.

At that point, you'd have known that you weren't on the same page and could have moved on.

I was open to anything as long as she doesn't abort the baby, I was willing to marry her, settle on a legal contract that she wanted,

Why would you marry someone you barely know? Srsly, stop being ridiculous. And again, next time, find someone who's on the same page as you in terms of abortion.