hey Kim
My twins were born at 31 weeks
although it was a bit hairy at first, they are nearly 5 years old and have no probs being born early.

Your twins will be in hospital for a couple of months until they are at least 36 weeks gestation, maintaining their own temps, feeding and over 2kg, so you will have time to preprare before they come home!
IF you have any other questions, feel free to ask
my twins were c-section as twin 1 was breech and his placenta had stopped working and had to come out pretty quick.
One of the the other forums i am on, had a woman who's membranes were bulging and her cervix was on 1cm in Sept. She is now 33 weeks!!! So rest, rest, rest!!!!
keep them in as long as you can- for every day inside you is two less days in NICU/Special care!
make sure you get to see the special care/NICU facilities before you deliver so its not so scary!!
take care and good luck!!
odette