Day 31 and no baby rabbits yet

Default Day 31 and no kits yet?
This is her first litter and she's huge and already started nesting,but has yet to kindle all my other does usually went on day 31 when today is the 31st day and she has not kindled yet her nest is made she still eating i am so confused I know for sure she is pregnant because my vet confirmed it and she's huge her belly is dragging on the floor.btw I can't contact my vet she's in the USA ATM.