Except as otherwise provided by Section 171.046, a person may not perform or induce or attempt to perform or induce an abortion on a woman if it has been determined, by the physician performing, inducing, or attempting to perform or induce the abortion or by another physician on whose determination that physician relies, that the probable post-fertilization age of the unborn child is 20 or more weeks.
Tex. Health and Safety Code § 171.044