You would think that the feminists would be gathering their vats of tar and feathers on this one too, regardless of their stand on abortions. This medication is too dangerous to be offered without medical supervision. This one is bad for everyone, but as you mention, especially for embryos (which is to say, unborn babies).
The real pro-death crowd isn't interested in safety for women, they're interested in maximizing the opportunities for non-reproductive sex. Women dying in the process is mere collateral damage, just as babies dying in the process are an annoyance.
It's the same insanity that motivates the homosexual crowd, for some of whom the possibility of dying of AIDS is a small price to pay for promiscuity.