If convicted (we don't know the circumstances of the evidence), felony DUI (death) is usually 1-3 years in prison.
It's unfortunate, but it was still just an accident. DUI is just another traffic violation. The only reason it's viewed as so abhorrent is because you people have been brainwashed by the government smear campaign. They want you to think DUI is the worst thing anybody could ever do, that way they can fuck people out of thousands of dollars without anyone fighting against the law.
I feel like causing the death of an innocent mother and unborn child is pretty far up there among "worst things you could do" ---