It concerns me that you're asking these questions because it indicates that you don't have a breeder mentor or someone you're learning from. It's important for you to be able to have someone like that if you're breeding g for many reasons, not least of all because they can answer your questions and actually show you things that we can't. It would be advisable to find someone in your local area to learn from if you continue to want to breed. Please make sure they are reputable. You're welcome to message me about any of this if you have any questions.
I really hope it's a false pregnancy and your bunny is ok.