Both my rabbits mated 4 days ago and now she is pulling her fur out whats it mean?

Hey there, Rabbits tear their fur out, making a nest for the babies to be born. Baby rabbits are born hairless & blind, the mother uses her fur to keep them warm. Make sure the babies are not touched by anyone, except for it's mother & father. Make sure you always have fresh water & food available, as the mother needs more because she is feeding herself & her young. If you notice that in the housing part of the hutch, there will be a nest getting built. Don't touch the nest, she will only have to pull more hair out of her chest. I hope I have helped. Goodluck with the babies, they are gorgeous & so tiny!