I saw a trailer for quite a recent film but can't for the life of me remember its name, its about a world where no one can conceive but then a woman becomes pregnant.

Children of Men

Children of Men (2006) (http://www.imdb.com/title/tt0206634/)

i saw a trailer for quite a recent film but can't for the life of me remember its name, its about a world where no one can concieve but then a woman becomes pregnant.
I saw aeon flux a few months ago and I remember that the story was something like that. No one could conceive but later its learned that aeon sister
(friend?) was pregnant and that's why she was killed I think. I doubt this is what you're looking for but hope it helps.