Dwarfs mature early, so chances are high that she is actually pregnant. My rabbits start nesting just hours before delivering, so it's time to act quick. Put the nestbox where she started building a nest (with a sheet of styrofoam under it), put the nest in it (or make one with hay).
Bucks get disgustingly horny when the doe delivers, that's really bad. Check the doe as often as possible, if kits are born outside the nest they need to be warmed up and put in the nest. If the doe doesn't pull much fur you can help with dryer lint, cotton wool, or pluck some fur from her breast (if it comes off easily).
You can make a provisorium for the bucks in the run, any kind of sturdy, rather big box, even cardboard, with 2 openings cut in (they don't like being trapped and avoid spaces with just one entrance) will do, a little off the ground to keep it dry (like, on a pallet), and some cover to protect the contraption from the rain. Then look for a second hutch/cage. They will be fine for some months with less than the recommended space if they have access to the run regularily, but they should not be out in the dark if it can be avoided, even cats are a danger to small rabbits.
I would have the bucks neutered asap, so they are over it by the time the kits, if there are any, are old enough to go (8 weeks). Even if she doesn't kindle now you'll have to keep them seperated for at least a month since they humped her just now, and it also takes that long to render the boys infertile after ther neuter.
You're right about the learning curve, I ended up with a surprise litter in my kitchen when I took in my two first "does" for quarentine...
Good luck