Police in the United Kingdom are using data from period tracking apps and mass spectrometry tests conducted on blood, placenta, and urine to investigate patients who have had “unexplained” miscarriages.
Though abortion is legal in the UK, there are TRAP laws in place requiring certain conditions to be met first, paramount of which is that two separate doctors need to agree that the patient meets the criteria of the 1967 Abortion Act before any treatment can go ahead. Self-managed abortion is a criminal offense with a maximum sentence of life imprisonment in the UK, as is any abortion performed after the pregnancy has progressed passed 23 weeks and six days, unless the patient is at risk of serious physical harm or death, or the fetus has severe developmental anomalies.
paper calendars work ok. apps are better at collating and predicting based on past data, and therefore giving you a better idea when and what to expect and whether it’s “normal”.
apps can help you provide a condensed report, which helps when seeking help from a doctor. it shouldn’t work that way, but at least in my anecdotal experience, the Dr who dismisses handwritten notes for 3 months, was more reasonable when it was “data collected via app”.
I stopped using an app a few years ago, because of privacy issues, but there are absolutely good reasons people still use them when a calendar works.