Don't even think that! You got your first deer, and be darned happy. It is much like your first fish. I will very often keep a smaller fish than I normally would, but it seems like once that first one goes in the ice chest, many more soon follow. So instead of a doe that might have several fawns next spring, you bagged a deer that is not going to have fawns and is more likely to be preyed upon by coyotes over the winter or not make it through the winter. Just make good use of the meat and all is well.