How do we know if a rabbit is pregnant and if it is, how long it will take for rabbit to gaive birth...?Urgent?

okay well I breed Rabbits so make sure when breeding you put the female in the males cage with him and leave her in there for about an hour put her back in her cage and the next day put her back in with him and she she starts stomping and try to bite him take her out and that means she pregnant and the pregnancy is about 30-35 day make sure you have a box of hay in her cage so she can hind her babies from people do not touch the babies untell they jump out of the box there selves or she will not take care of them if you mess with them but if you have to pick one up make sure you put baby powder on your hands and slap so it not to powdery that way she cant smell your people on them