What I mean is that the procedure for extracting a live embryo or fetus is different than the procedure required for abortion. Just because a woman consents to the procedure required to extract the embryo/fetus, does not mean that she consents to the more complex procedure of extracting it alive. A court cannot force her to submit to the latter just because someone else wants the embryo/fetus to stay alive.
Which gets back to the question of viability. If a woman who's 38 weeks pregnant decides she wants an abortion (not for any medical reason but just because she decided she didn't want a baby), it's a more complex procedure to extract the fetus alive than it is to extract it dead. The same holds true for fetuses who are 30 weeks along. In neither case could the woman find a doctor who'd do the procedure for her and I would say those doctors would be correct since it would be an act of murder to abort a viable fetus, even if it's a premature baby who needs to spend a few weeks in an incubator at the hospital in order to survive.
As the term gets earlier than that and the fetus can't survive on its own, the non-viable fetus becomes a non-issue and it's all about the woman's choice. It can't survive without her body and it has no right to her body so she can trash it as she sees fit.
An artificial womb is just a high tech incubator. If a fetus is viable when taken out and placed in one, then what's the essential difference between putting a viable fetus in an incubator at 10 weeks or putting a viable fetus in an incubator at 30 weeks? Both need medical intervention to survive without the mother, but both can survive quite well if she has Procedure A instead of Procedure B. In each case, in the choice between the rights of the woman to do what she wants with her body and the rights of the fetus to live, I'd give more weight to the rights of the fetus.
Viability of the fetus (without serious medical issues which result) is the dividing line for me for when abortion becomes murder. If the fetus needs her body to survive, then fuck it because it has to die. If it doesn't, then fuck her because she's getting a child she doesn't want. It's not about her choosing which medical procedure she wants, it's about her not being able to have a doctor commit an act of murder.