Welcome to the forum Karina. I'm sorry - I did laugh a tiny bit at your situation even though it could've been even more serious had the girls been something smaller like Netherland Dwarfs. Just one quick question - are you sure all three girls are girls?
Also - I had been told you couldn't breed a buck w/ a split penis...that it wouldn't work...so I'm a bit surprised.
This is an awesome resource on baby bunnies:
http://www.debmark.com/rabbits/bunnies.htm
Let me reassure you of two things -
a. Accidents happen....and we understand. You did the best thing by taking your buck in to be neutered and at least you know it shouldn't happen again.
b. You are VERY welcome here. You may want to visit the breeder's section of this forum to askquestions about the babies too.
The biggest thing to watch out for at this age (in my opinion only) is that when they're eyes start opening (and it doesn't take long)....that if someone doesn't have their eyes open within a day or so of the rest of the nestmates....you take a warm cloth and help them remove any crust from their eyes.
Also - be prepared- once their eyes open - life gets FUN....or at least busy.
If I'm understanding correctly - your rabbits have free roam of the house most of the time - right? If that is so - especially with the babies - be careful where you step during the night, etc. because that seems to be when the little ones might want to play. Also - be sure to bunnyproof things that the babies might want to chew on - like cords, etc - but you've probably already done that for your house anyway.
Don't feel bad about what has happened though - you've done what you could - and now we'll help you raise up those babies!
Peg
P.S. Once again - welcome!