Do not trust the exterminator to know if something they use is actually safe for rabbits or not.
They're spraying stuff literally designed to kill animals - why on earth would you ever just hope for the best and that your pets won't be affected? That would be extremely poor judgement on your part. There's literally thousands of things that are deemed "safe for pets" because it doesn't kill too many dogs or cats to warrant using a different product (it usually does still kill a small percentage of those though, too).
If at all possible I would do one of two things, if I were you:
1) get your rabbits (and any other pets you might have) out of the home for the next 30 days - yes, 30 days
or
2) cancel the exterminator until after you have tried using diatomaceous earth (it'll cost you about $10 and is completely safe when used properly - just don't go crazy with the dust clouds they can make when you're applying it, and if possibly move pets to a different room for an hour or so until the diatomaceous earth all settles, so they don't breath a bunch in)
BTW - diatomaceous earth works literally every single time. Be sure to ONLY use the food grade kind and NOT the stuff for swimming pools. Health food stores, Tractor Supply or many places online sell food grade diatomaceous earth.