I'm sure a woman was already arrested for a miscarriage after a nurse informed the police.
Not just arrested, but convicted and sentenced to four years in prison. From the BBC: US women are being jailed for having miscarriages
Very clearly a test case to establish precedent. A minority who was using illegal drugs that might have
led to the miscarriage is the perfect victim. Conservatives can say "Well, she shouldn't have been doing drugs. She knew
what she was doing. It'll be easy for good women to avoid this, they just have to not do illegal things while pregnant. Do you want women to be doing drugs while pregnant?"
The problem with that reasoning is that "grandpa's record collection" and "computer power cable" very easily become "hazardous materials with known abortifacient properties" when filing negligent homicide charges. And "she knew what she was doing" can very easily be stretched to any sort of exposure to a variety of chemicals, physical forces (car rides, exercise, etc). "Don't do illegal things" applies to "don't have a miscarriage" when miscarriages are illegal. "Do you want women exposing themselves to harmful chemicals while pregnant?"
But everyone here knows all that, and I'm just ranting to the choir.
EDIT: Here are more cases Women are being jailed for losing their pregnancies. The US’s post-Roe v Wade reality is already here
Article includes Marshae Jones, who was indicted on manslaughter charges after being shot and losing her pregnancy, Keysheonna Reed, who was charged with abuse of a corpse after having a stillbirth, and a link to a paywalled NYT article about five women in Arkansas who have been arrested for stillbirths or miscarriages.
The National Advocates for Pregnant Women (NAPW) has documented 1,254 cases where women were arrested, detained, or otherwise deprived of liberty "in which being pregnant was a necessary element of the crime or a 'but for' reason for the coercive or punitive action taken."
It's a lot more common than I realized for women to be harassed using their pregnancy as a pretense.