Hello Doctor,I had an unprotected sex with my girlfriend during her ovulation period,twice on the same night,she ate Postinor2, 2 tablets for the first round and 2 tablets for the second round,total 4 tablets.I did instructed her to douche her vagina to clean the sperms if it may reduce the chance for pregnancy.Does the Postinor2 effective to prevent pregnancy if eaten during her ovulation?