You would not have to change these types of state laws to produce draconian consequences. Once the state constitution is amended to declare that a person is created at conception, than that person has all the rights and priviledges of a person who has been born. And if a child dies two weeks after conception because of the reckless behavior of the mother, than I don’t see why you would have to change the law to prosecute her for negligent or reckless homicide. Seems to me you would have to change the law to protect the mother from prosecution and that may create a different set of unintended consequences.
I think if you have an accidental death two weeks after conception it wouldn’t be considered the same as intentional harm (murder) after conception.