How do i know if my rabbit is pregnant?

It has been 17 days since she was with the male rabbit. I tried to feel her stomach but i cant feel any movement or babies. She hasnt tried making a nest ,but she does have brown crust on her ..could that mean she is producing milk and is pregnant? This is her first time being bred and she is 11 months old. And if she miscarried i dont know what is the best thing to do??