ok i know they can vomit prior to whelping but for the last few hours she seems not to even be able to keep water down! bit worried about dehydration, this is our first litter, and i have been reading every thing i can get my hands or eyes on and was wondering about due date if she delivers magically on the 63 that should be mon, but she is huge and donot think she will go that far but have read they can go till 72 days! (can't be true surely! she wont fit  through the door!) what do you guys think?

If it were me she would go to the vets if she cant keep water down.  She is going to need all her strength for whelping and if she is dehydrated it will not help.  Just my opinion others might say it is normal but I always tend to be overcautious at this stage.

Contact your Vet for guidance.

I agree, contact the vet asap - if you haven't done already.  Good luck

my dog is due aswell and i rang the vet and she said if the dog
is vomitting and cant keep water down or has green discharge.
take her in asap, as there may be complications.

i hope all is fine. let me know
;)