I had a doe get pregnant with 14 weeks this year, I didn't notice it until 6 weeks later when 6 more rabbits were hopping through that hutch. I very rarly see any movement of kits, most times I can'tr even tell for sure if she's pregnant. Over the years, this was the 3rd young doe that accidentially got pregnent, they all did fine. Breeding is what rabbits evolved for, that's what they excell at, producing high numbers fast. So, a pregnant rabbit isn't really a reason to see the vet as long as everything is normal. That high reproductiion rate also compensates for quite some losses, sometimes there can be problems, and sometimes first timers have some problems doing everything right in time and in the right order. Also, spaying a pet rabbit is a good idea, those false pregnancys and hormonal swings can be a bother, apart from that they get actually pregnant at every opportunity. So, I would avoid stressing her, give her a nestbox, lots of hay and when the time comes (mine lose some appetite 1-2 days prior kindling) would check at least every 2 hours, in case something goes wrong like kits being outside the nestbox. I also give pregnant does extra garden time to hop around and dig, since in my opinion it's good when they get some exercise.