I think this question is specifically about where abortion should be legal in some circumstances (though narrow) or it should be illegal in all situations and anyone who gets an abortion should be prosecuted and sent to prison (along with those who perform the abortion, whether medically qualified or not). This question is distinct from whether you believe abortion is always morally wrong no matter what the subjective justification in the person’s conscience might be, or whether you believe abortion can be morally justified in some situations (such as rape, incest, or danger to life or health) as the person may in some cases feel in conscience they cannot continue the pregnancy.
Without trying to enter into the merits of the abortion debate, which generates more heat than light, I think trying to use penal criminal laws to enforce what is essentially a moral issue is problematic. Most people, regardless of religious belief, agree that the intentional killing of the innocent is always wrong, and I am sure most would also agree that where a human outside of the womb is concerned, a person who does this should be criminally liable for such an act.
Unfortunately such agreement does not exist in relation to the unborn. The application of principles of criminal law in relation to abortion would be problematic. Should a woman who terminates a pregnancy at say, two weeks be treated in the same manner as a robber who shoots a store owner down in cold blood during a botched robbery? Should a woman who procures an abortion following a rape or act of incest by a relative be sent to prison? Should a woman who would die if she did not have an abortion be imprisoned? Any good defence lawyer acting for a client in such a case would be able to portray the victim in a sympathetic light and the person charged would probably be able to avoid being convicted, after a costly criminal trial. Such laws would also likely lead to outcries of injustice, especially from women, who would see such a law as further punishment and victimisation of women who had already been violated by sexual offenders.
Whether you are pro-life or pro-choice, making abortion illegal in all circumstances is fraught with problems, just as the criminalisation of other actions (i.e. homosexuality, recreational drug use, prostitution, prohibition, etc) on moral grounds can often lead to questionable outcomes. Criminalisation often drives these activities underground, leading people to seek the same thing from questionable sources. Criminalisation of abortion on moral grounds in the past led to the phenomenon of ‘backyard’ abortions which led to severe internal injuries and deaths of women, often in considerable numbers, and this continues in countries where criminal sanctions for abortion still exist.
I think the law is not the appropriate tool to use to try and deal with the problem of widespread abortion, especially the harsh sanctions of criminal law. I would not want to see a woman who had been raped and then obtained an abortion serve prison time and be further punished and traumatised.