The bottom line is that you have absolutely no idea how you feel after the baby is here.
You can be adamant you are going back to work, that baby is going into nursery at 6 months and that MIL is having her one day a week, then you hold baby and it all goes out of the window.
People are probably just trying to get everything in order, While you need to be realistic do not let anyone spoil the pregnancy for you.
So when nurseries are suggested, if it's on the cards you will go back, research them, pick one and tell your husband that a name can be put down now for it and utilised if you go back once the babies here.
I'm assuming you and your husband have an ideal plan of what life will look like when baby is here, and then a contingency plan for if you feel completely differently once they arrive?
If you don't, I would make that a priority, you both need to be on the same page for when baby arrives
Just tell everyone else ( make it your strap line for any conversation surrounding baby that you don't want to engage in) "it's far too soon to be making any plans, let's just enjoy the pregnancy and we can sort everything once baby is here"
Yes I do understand, I hate people trying to organise my life for me.