Whack em and stack em. Makes virtually no difference whether you killed that doe in October or next week... The end result is the same.
This.
Tracie's doe has 2 fetuses in her, first time I've ever seen this. She was more fascinated than disturbed. If you think about it, killing a doe can kill multiple deer at any time. Shoot her opening day and her fawns have any decreased chance of survival as opposed to shooting her now after the fawns have 3.5 more months of survival training and deer are herded up, providing safety in numbers.
Shoot her anywhere from the last week of October until now, it's likely she's been breed. Whether you shoot a doe that's been breed today or 48 after she was breed, you are ensuring those eggs don't turn into fawns on the outside.
If you need meat, shoot one. That's why she killed one and I'd have her do it again.