In addition to consulting your vet if you have concerns, I’d recommend doing a Google search right away – there are several sites that have very good and extensive information on what to do when a doe is about to kindle, including things you can do to help a first-time doe with things like nest building. You might need to help her with fur-pulling, for instance, by gently pulling some (it gets very loose around the chest/abdomen area in the last week or so of pregnancy, IIRC, so is very easy to pull), or collecting loose fur. You’ll need to designate a nesting box separate from her usual litterbox; when she gets to building her nest, make certain of where she’s doing it and set up the nesting box there.
Once the kits are born, the most important thing to do is to make sure that they’re properly situated in the nest – they should be snuggled up together for warmth, which they need – and that they’re being properly fed by their mother. Rabbits only nurse once or twice a day, usually in the predawn or nighttime hours so you probably won’t often see her in the act of feeding her babies. Well-fed babies should have round, plump-looking tummies that may have a somewhat translucent appearance with their mother’s milk (which is exceptionally nutrient-rich) visible. Speaking of nutrition, you should start giving your doe alfalfa hay if you aren’t already. Adult rabbits usually shouldn’t get much if any alfalfa hay because the protein content is too high for them, but pregnant and nursing mothers are an exception because they do need lots of protein to develop the fetuses and then feed their kits properly.
I gather this is your bunny’s first litter, so there’s a good chance it’s going to be touch-and-go with the newborn kits; it’s unfortunately common for at least one of the litter not to survive, particularly if they’re a dwarf breed (dwarf rabbits produce a certain percentage of excessively small and undeveloped newborns called “peanuts” which never manage to live more than a couple of weeks). The kits that live and thrive will open their eyes and raise their ears at around 10 days or so, and their fur will grow in at around the same time. They’ll start to get really lively and active at around 3 weeks or so. They need to stay with their mother until they’re at least 8 weeks old, to allow them time to be properly weaned and develop healthy GI flora from eating their mother’s cecals. Once they’re old enough, they should be started on alfalfa hay and alfalfa-based pellets, which they should eat until reaching their full adult growth when they should transition to timothy or other grass hays.