The nearer analogy would be if someone published a recipe and instructions for making the pill.
I think that would still be "assistance," but much more likely to be covered under free speech laws, that disseminating information about something (publishing instructions) is generally already protected.
Even then, though, were such publication to be banned, it would still be the case that nobody is being "forced to remain pregnant."
Those are both primary uses for those drugs so manufacturing and delivery isn't knowing assistance.
Then you suggest it is legal free speech for me to divulge that if you take one, wait 48hrs and take the second, it is precisely what would occur if you requested a drug induced abortion in a place that allows those?