This chapter does not apply to the death of an unborn child if the conduct charged is:
(1) conduct committed by the mother of the unborn child;
(2) a lawful medical procedure performed by a physician or other licensed health care provider with the requisite consent, if the death of the unborn child was the intended result of the procedure;
(3) a lawful medical procedure performed by a physician or other licensed health care provider with the requisite consent as part of an assisted reproduction as defined by Section 160.102, Family Code; or
(4) the dispensation of a drug in accordance with law or administration of a drug prescribed in accordance with law.