Merry Christmas

I know nothing of The Nativity Story's merits qua film. As a demonstration of reviewer ignorance, however, it's most excellent:
Mary's] aging cousin Elizabeth (Oscar-nominee Shohreh Aghdashloo) is experiencing a similar miracle, newly pregnant by her equally ancient husband Zechariah (Stanley Townsend), a priest. Mary convinces her parents to allow her to visit the pious couple to sort out her life. It is here she experiences the Immaculate Conception.

Don't get it? Refresh your understanding of that doctrine here. Confusing the Immaculate Conception with the Annunciation is fairly common, even among Catholics but, um, did the reviewer not see the movie? Or read his own sentence? If both women are pregnant in the scene, how is conception involved at that point? Let's collect the coming howlers, shall we?