The easiest way is by palpating her. Flip her on her back and gently press on her abdomen. If there are grape-size lumps in her abdomen then she is pregnant. Also, the breeder should also keep an eye out for behavioral changes. While no all does undergo a personality change while pregnant, it does happen and it is another indicator of pregnancy.
About 28 days after breeding the doe, she should be given a nesting box (arba.net). This gives the doe a designated place to have her babies. They are typically made out of wood or metal. The bottom of the box should be solid rather than wire like the rest of the cage. Having wire bottoms where the babies are runs a risk of them falling through the cage or getting stuck in the wire.
About 48-2 hours before giving birth, she will begin to pull fur off her abdomen. Since baby rabbits are born with no hair, the fur she rips out will be used to keep the babies warm until their own hair grows in. She will also need material to build her nest, such as straw and newspaper, as well as a nesting box. The size of the nesting box will depend on the size of the rabbit. This box gives the rabbit the option of a designated space to deliver, but not all rabbits will use