If they want an abortion, they get one

I agree, but only for the first half of the pregnancy.

If the doctors believe that the pregnancy is non-viable or carries an extreme risk to the parent, then the decision to terminate should be made only by the pregnant person.

Also agree. Abortion for medical necessity should be allowed for the entire pregnancy.

And the doctors now risk getting arrested

Only if they violate the above. Doctors can already get arrested for malpractice, and I see this as essentially euthanasia of an unwilling patient. Police would need to prove intent to violate the law.

I think it's incredibly unlikely that doctors would actually be arrested unless they're knowingly doing a lot of illegal abortions.