The Supreme Court is expected to rule soon on whether abortion providers and the Biden administration may challenge the law notwithstanding its novel structure. In September, the justices turned down an emergency request to block the law.

Many physicians say they cannot intervene in complex pregnancies that may not pose an immediate threat to the patient but can rapidly spin out of control. Some hesitate to counsel patients about the option of termination, or refer them to doctors in other states, for fear their advice could be interpreted as aiding an abortion.

Supporters of the law say their goal is to save the life of every embryo, regardless of the circumstances of conception.

“We never advocate taking a life of an unborn child unless it is necessary to protect the life of a woman,” said Joe Pojman, executive director of the Texas Alliance for Life.

Even in cases of rape or incest, “we don’t advocate for taking the life of an unborn child for the crime of the father,” he said.

The law’s supporters say that it provides sufficient leeway for physicians to act if a mother’s life or bodily functions are compromised, and they insist those cases are rare.

Dr. Ingrid Skop, an obstetrician in San Antonio who belongs to the American Association of Pro-Life Obstetricians and Gynecologists, said that even a girl as young as 9 or 10, impregnated by a father or a brother, could carry a baby to term without health risks.