After taking the pill for a decade, Elodie Monnier Legrand decided to try ¡°natural¡± birth control, an increasingly popular trend that requires tracking fertility to avoid becoming pregnant.

¡°I wanted my body to return to its natural state,¡± the 30-year-old French business owner said.

However after getting two abortions within six months, she discovered the app she was using had slightly miscalculated her fertility cycle.