The Unborn (2009)

The Unborn is a 2009 a supernatural horror-thriller film written and directed by David S. Goyer. The film stars Odette Yustman as a young woman who is tormented by a ghost (a dybbuk) and seeks help from a rabbi (Gary Oldman). The dybbuk seeks to use her death as a gateway to physical existence. The film is produced by Michael Bay and Platinum Dunes. It was released in American theaters on January 9, 2009, by Rogue Pictures.

Plot: Casey Beldon has nightmarish hallucinations of strange-looking dogs in the neighbourhood and an evil child with bright blue eyes following her around. While babysitting Matty, her neighbor's son, she finds him showing his infant sibling its reflection in a mirror. Matty attacks Casey, smashing the mirror in her head, and tells her: "Jumby wants to be born now". She puts him to bed and leaves in shock.
Casey's friend Romee tells her of a superstition that newborns should not see their reflections in the mirror for at least a year because otherwise they will die soon. Casey's eyes begin to change color; a doctor asks if she is a twin, and explains the change as tetragametic chimerism and heterochromia, and that is completely normal. Her neighbor's infant dies, supporting the superstition.
Casey's father admits that she had a twin brother years ago who died while he was in the womb when her umbilical cord strangled him, and whom he and Casey's mother had nicknamed "Jumby". She begins to suspect that the spirit is haunting her and that is the soul of her dead twin wanting to be born so it can enter the world of the living as evil.
Casey meets Sofi Kozma—whom she later learns is her grandmother—who explains that as a child she had a twin brother who died during Nazi experiments in Auschwitz during World War II. A dybbuk brought the brother back to life to use as a portal into the world of the living. Kozma killed her twin to stop the spirit, and now it haunts her family for revenge, which is why Casey's mother became insane and committed suicide.
Kozma gives Casey a hamsa amulet for protection; instructs her to destroy all mirrors and burn the shards; and refers her to Rabbi Joseph Sendak, who can perform a Jewish exorcism to remove the dybbuk out of her soul. Sendak does not believe Casey's story until he sees a dog with its head twisted upside down in his synagogue. The dybbuk kills Kozma and, soon after, Romee. Casey and her boyfriend Mark—who both see the spirit after it kills Romee—realize that it is getting stronger.
Sendak, Mark, Episcopal priest Arthur Wyndham, and other volunteers begin the exorcism, but the dybbuk attacks them and several are wounded or killed. The spirit, having possessed the priest, chases Casey and Mark. Mark knocks Wyndham unconscious but gets possessed. Casey stabs Mark in the neck with the amulet; Sendak arrives and he and Casey complete the exorcism. The rite draws the dybbuk out of the human world, but Mark falls and dies during the separation.
Casey mourns her boyfriend but still wonders why the dybbuk became suddenly active in her life now, and why it didn't attack her earlier. She takes the pregnancy test, and learns that she is pregnant by Mark, with twins.