DCM, it does happen, but rarely. I do not remember the exact circumstances now, as it was back in the late 1980's, but a high school friend of mine was in that position. She had married the father of her child after she found out she was pregnant, so both were trying to do the right thing for the child's sake. As the pregnancy progressed and the problems began, and she got sicker and sicker, they finally had to decide that it was a life and death choice for her, with a VERY low chance of the baby's survival no matter what they did.
The marriage ended within six months.
All were traumatized by the abortion, and it was worse than they expected. The baby was an "unplanned" pregnancy so it was the "right choice" ....