I have raised rabbits for over 10 years, and I also showed them. Never I repeat never let the buck and doe live together, Your lucky she hasnt castrated him yet, which will most likely happen if you leave them penned up together. If she accepted the male she will lift up her hindquarters for him and breeding takes like 10 secs and he will fall over. The average due date is 31 days from the day the breed. Put a nest box in there around day 27 with some straw, hay, alfalpha, shreded paper or anything of the sorts, she will make a nice nest and pull fur for them, do not ween them till 6 weeks and just so you know they are deaf and blind when born. any other questions just post.