Never sign a contract you haven’t read (preferably had a lawyer read over), no matter who it’s from. If he’s set on bringing in contracts and lawyers, he should have no problem with you doing the same. It’s iffy he decided to do it at such short notice, tbh, so if he kicks up a fuss at you wanting a lawyer to look over it, then you really want a lawyer to look over it.
And if your lawyer finds it unreasonable, you might want to think about why your soon-to-be husband wants a pre-nup that vastly favours him, should that be the case. A pre-nup is fine if it’s protecting one or both partners fairly, but if you have another agreement in place that makes your situation imbalanced because your money is going towards expenses while he’s saving/putting money into something the pre-nup shields him from you accessing, that’s off.
ETA: NTA