No, we found no record of her being pregnant at the time they're filming Ghosts of Girlfriends Past. She has three children: daughters Violet Anne (b. December 2005) and Seraphina "Sera" Rose Elizabeth (b. January 2009), and son Samuel "Sam" Garner (b. February 2012).
The 2009 movie Ghosts of Girlfriends Past tells the story of Connor Mead, a famous photographer and confirmed womanizer. He takes a break from his playboy lifestyle to attend his brother's wedding, where he becomes reacquainted with Jenny Perotti (Jennifer Garner), the only girl who ever captured his heart. After Connor delivers a drunken speech at the rehearsal dinner where he says that love isn't real, he's met in the bathroom by the ghost of his uncle Wayne (Michael Dogulas), a Hefner-esque horndog who taught Connor everything he knows about picking up girls. Uncle Wayne informs Connor that, over the course of the evening, he'll be visited by three ghosts who will lead him through his romantic past, present, and future.
The movie also starred Matthew McConaughey, Michael Douglas and Emma Stone. See full cast and crew at IMDb.
Check out Ghosts of Girlfriends Past Trivia at FamousFix.