I'm not saying that the girl is right in this situation. The problem is mainly that shes pregnant and the risk to the pregnancy if they want to have the kid. I don't put much stock in the fact that its "his or her" baby. It really isnt that hard to make one. I'll say this to be the devils advocate.
A lot of girls are as hesitant and unoptimistic about the marriage/relationship as guys. It's more often the case that the guy/girl both think that its unlikely to last. The guy's money is the guy's money, unless you're giving her the money. That's just how they see it. Unless the money is in her account, she really doesn't see it. Her being supported is an euphemism because she's basically going to have to come for handouts whenever she wants something. However you want to rephrase it, this is true unless she's being given money upfront. Especially if there is a prenup involved. So the question of support is more often than not questionable. These girls have seen a lot so I cant really blame them either for looking out for their own finances. If they make less now and then it doesnt work out, you just wasted a shit ton of their time and money. If I had an atm between my legs, I'm not sure any of you dudes would be worth it either LOL.
There's always going to be exceptions to the rule, but there's a reason why they're exceptions. More often than not, rent is safer than buying. But thats true for any marriage. Marriages in the best of times and circumstances are destined to fail.