Chinks I'm so very sorry. Must be a terrible shock to have him change his mind like this. It also doesn't help that you'll be full of hormones and really vivid feelings as it is - I was very sceptical about this before getting pregnant, but even as a very rational and mostly stoic person, it's definitely been a rollercoaster, and that's just in daily life. So this whole situation must be really hard on you. 💐
I agree with Kentishgal that you'd resent him if you just 'respect his wishes'. It would eat away at the relationship. There are two people's wishes to respect here, you had an understanding, a common goal, and now he wants something different it's not automatically on you to deliver that.
Is it possible to get to the bottom of what is worrying him - money; perceived loss of freedom once again, while the baby is little; the perception he won't be as close to you; fear of not being good enough somehow... Is it possible to get you both to a talking therapy of some kind? You've still got a bit of time. If not formal talking therapy, are there any sensible family members that can help get to the bottom of it? I know this would work in some but not other families...
I think the main thing is for you to focus on you, day by day, or hour by hour if need be. You're lovely. You're pregnant. You have time to think and work through this (ideally with him, or alone). Take the time and take care of yourself above everything else.
Kentishgal I'm 1:800 and also thought this was too low even though technically low risk. Didn't get much of a response here either way and looking forward to my NIPT result in a week's time, hopefully for peace of mind, or at least for more clarity on the extent of any problem. The NIPT was a lovely process and you spend a lot more time being able to see the baby.