Hi Brid,
May mean it is more than twins....Nubs do tend to think in triplets + !!!!!!
Possibly better to restrict exercise until kidding..... or make an udder bag from an old pilowcase to protect her.
Other than that there is very little you can do...obviously make sure mastitis isn't brewing but I doubt it.... more like a multi kidding. Personally, unless there is a medical reason to do so, I don't scan....... simply because it is unreliable in goats particularly Nubians. It is perfectly possible for a kid to 'hide' behind another.
Just to complete the picture...many years ago when I did scan....... 1 particular goat was scanned as twins, poss triplets but absolutely no more than that !!!!! She gave birth to 6 !!!!!! All survived quite happily.