The number of fawns is related to the age and health of the mother, and several outside influences such as the size of the herd. A crowded area may cause mothers to have only one fawn or to not have any due to stress and low nutrition. Obviously nutrition wasn't the limiting factor here but high pop numbers could be retarding the fawning numbers.

As far as feeling bad, well I wouldn't worry about it. How many of you have cracked an egg? Same difference. If you take a doe this late in the season you are most likely going to be killing a pregnant doe. Just treat them both with the respect they deserve and utilize her properly and it will be a good thing.