You may object to it, but the 14th Amendment mandates federal government prevent the denial of equal protection of state law to all persons.
If fetuses are held to be persons—as they should be—then the federal government is indeed mandated to prevent it in every case not meeting the strict scrutiny of the courts.
The if they are provided every protection extended to any other child, any miscarraige should be investigated as a potential homicide, just like the unexplained death of any child.