Regular purchase of prenatal vitamins is probably a huge marker for either being pregnant or intention to become pregnant.
Just shopping in the store and lingering by those products for a few moments is enough for the algorithm to detect a possible pregnancy. They use Bluetooth beacons & camera software to see how long you look at everything in the store.
alt Hacker News
Just shopping in the store and lingering by those products for a few moments is enough for the algorithm to detect a possible pregnancy. They use Bluetooth beacons & camera software to see how long you look at everything in the store.