I know. I have a lot of trouble finding old sources. I get them eventually. My notebook unfortunately disappeared at some point, so I’m left with a lot of imprecise sources. I can’t memorize anything, much as I would love to.
Meat and fish are assumed to be Assur because it’s a Sakanas Nefashos. It’s in the Siman in Shulchan Aruch of things that are dangerous. Yes, a Gemara says it’s Kasheh L’Davar Acher but the general assumption is that it’s a physical danger also. And the Yabia Omer was the same one we each had.
I was just assuming that most abortions are done by chemical and not physical means. If that’s not true then I admitted I may have been incorrect.