Any other sibling reveals go bad?

So we told my two daughters about the baby tonight .. My 6 year old cried and was sobbing hysterically about not wanting another baby in the house and how much things were going to change.  She kept begging us to tell her it was just all a joke.  Of course I reassured her we will love her just as much as now and make time for her.. What do I do?  I feel awful and just want to cry..