Pregnancy forces Cobie Smulders to re-evaluate her life in a trailer for Unexpected, Digital Spy reports.

The Avengers: Age of Ultron actress portrays a teacher whose surprise pregnancy leads her to question her future as both a mother and a teacher.

High school teacher Samantha Abbott (Smulders) is helped through her pregnancy by developing a bond with student Jasmine (Gail Bean), who is also expecting a baby.

The drama also stars Downton Abbey's Elizabeth McGovern as Samantha's mother, while Anders Holm is the teacher's husband.

Unexpected comes from Empire Builder director Kris Swanberg.

A cinema release is planned in the US for July 24. A UK release is yet to be set.