I repeat, it happened to me. It was in May, 1989. (By the way, my almost-17-year-old son is just fine, thank you.) If you think there aren't doctors out there that offer abortion on the basis of little or no indication, you're quite mistaken.
Since abortion is legally available to any woman who wants one, of course there are doctors who will offer it with "no indication", at least no indication beyond the woman not seeming sure she actually wants the baby. But suggesting abortion specifically in response to suspected Down Syndrome is a different matter. However, I'm not sure exactly what years the various techniques for ascertaining with certainty became available. I would have thought by 1989, but possibly it was a bit later. Today, at any rate, there is no doctor in this country suggesting that a woman go ahead with an abortion for Down Syndrome, based only on the "triple screen", any more than there is any doctor suggesting a woman go ahead with a mastectomy based on an unbiopsied lump that was spotted on a mammogram.
There's a lot of hyperbole on FR re abortion, and I've seen people within the past couple of years claiming that their obstetrician "told us we should abort" after a positive triple screen, when in fact what they were being told was just that abortion would be an option if Down Syndrome was confirmed by subsequent testing. Obstetricians have a massive problem with skyrocketing malpractice insurance rates (I've met one who switched to gyn-only after his ob rate went to $260,000/year, after 25 years of practice with not a single claim against him) and unfounded lawsuits. The last thing they're going to do is deliberately set themselves up for claims that will almost certainly result in a 7-8 figure payout and the end of their medical careers.