You raise a vital point. If abortion is to be protected to such an extent that we want government to attempt to convict women of murder if they abort their pregnancy, then we must enter a legal and regulatory regime that invites tyranny.
If the unborn are protected by the law to the full extent that you or I are protected, then if any woman shows even a hint that she is pregnant and later is observed as not being pregnant, then government will treat that situation as vigorously as they treat a kidnapping, starting by interrogating the woman on suspicion of murder and placing the burden of proof on her to prove she had not been pregnant.
We did not have a big government agency when abortion was illegal prior to RoevWade. Abortionists were criminals in those days. LOL! The mothers were not arrested - The abortionists were arrested.
When has anyone proposed such a law? Back before RvW, IIRC, only the abortionist was liable. Though fr too many women know exactly what they're doing when they abort, it's the butcher who should face the justice system, because they depend on lies to secure many of their "patients."