It turns out that they have the purchase history for hundreds of thousands of customers and they compute what they  call a pregnancy score, which is not just whether or  not a woman's pregnant, but what her due date is.
Resulta que ellos tienen  el historial de compras de cientos de miles de clientes y calculan lo que llaman  puntaje de embarazo, que no se trata de si la mujer está o no embarazada, sino para cuándo espera.