You will find a way @JulieMalooley. Check your entitlements with Centrelink to get an idea. Babies don't need all that much Luv though I'm sure they'll get a lot from family/friends which isn't a bad thing😊
Check the Multiple Birth Association out as often you'll be able to buy things in really good condition second hand if you wanted to. The Ladies with twins on the other thread will be able to help as well.
I know you're probably feeling scared & overwhelmed by it all right now but you have these months ahead to work out a plan with DP & put it in place.
Everything will be ok Luv by the time these bubs are born😊 ((((hugs)))xoxo