Help Me Pleasee!?!?!!??!?!!?!?!? 10 week old bunnies question!!?

Okay, I got 2 baby bunnies two days ago. They are both 10 week old dutch bunnies and I have a few questions. They live in an outdoor hutch together and we are not getting them spayed/neutered. Whether they are boys or girls. if they are different genders them we will get a separate hutch. Anyway, when we got them from the store, the lady told me that we wouldn't know what they were until about 6 months. Again, they are only 10 weeks old right now and we would like to know soon so that we have enough time to make another hutch. My question is: How soon can I really tell the difference? And, I need to know soon like I said so if anyone has any help at all, Please HELP ME OUT!!! 10 week old dutch bunnies. How can I tell what gender they are at this age??? I need ti know now. THANKS!! :D