The Back-Up Plan (2010)
Fall in love, get married, have a baby. Not necessarily in that order.
When Zoe tires of looking for Mr. Right, she decides to have a baby on her own. But on the day she's artificially inseminated, she meets Stan, who seems to be just who she's been searching for all her life. Now, Zoe has to figure out how to make her two life's dreams fit with each other.