Does what actually happen? Prosecutions for abortions? Yes. Warrants related to people getting an abortion? Yes. A period tracker being used as the jump off point for those prosecutions/investigations? Hard to say, maybe? If the data is being sold it isn't hard to imagine that prosecutors and busybodies aren't currently mining that data.
> isn't hard to imagine that prosecutors
mainly because I have no idea whether it's realistic to imagine what prosecutors do. I can also easily imagine it to be illegal and wildly unrealistic behaviour for a prosecutor, in my ignorance.
> Warrants related to people getting an abortion?
The question here isn't whether abortion is illegal in some states, but about period tracking data could be used as evidence, or justify an investigation - especially data that is seemingly illegally obtained. AFAIK, illegally obtained evidence is normally not valid grounds for investigation, and might actually weaken the case based on "fruit of the poisonous tree" doctrine.