Since the rut, in this part of the country, is in Jan. & Feb., it makes since that the does will get impregnated during this time. A deer's gestation period is about 200 days. Therefore,to kill a pregnant doe, you would have to shoot hersometime during Mar. thru Aug...Way out of the legal season.
I know on rare occasions, a doe can come into heat at various times of the year. So, itmay be slightly possible to kill a preg. doe during the season, but not likely.
Now, I'm not an expert or any kind of biologist. This is just some simple man logic, piecing together from what I do know about deer. Take it for what its worth. And if I'm totally wrong, someone with expert knowledge please correct me!