It is unusual for 3, AFAIK.
I've lived where I'm at in midst of a national forest for over 14 years and see herds of 8, 10 or 15 weekly, half dozen of small gatherings of 2 to 3 every day, mixed with mostly does but occasional young bucks, most does with 1 fawn and maybe 1 out of 6 does with 2 fawns but NEVER have seen 3 here.
She's got her hands (feet) full!
Thanks for sharing.
EDIT: about 5 years ago, we did see 2 does each with 1 fawn; we even saw them, all 4, grazing together and the fawns playing. A few weeks later we saw one of the 2 does (I'm pretty sure) with 2 fawns; we think the other doe got hit by a car or was shot, as it was during hunting season. Anyway, it appeared that the fawn was adopted by the surviving doe.
TonyR, I think you are correct that perhaps one of the fawns was "adopted". Earlier last month I saw a doe with one fawn and another doe with 2 fawns all in the same area but at different times. If you notice, one fawn is a bit smaller than the other two. Perhaps the doe with the single fawn was killed and the single fawn was "adopeted".