Woman finds out her boyfriend got someone pregnant they get married eventually

When a young woman's boyfriend dumps her after discovering she's pregnant, her mischievous co-worker comes up with a scheme to get back at him.

A young couple has lived together for five years, and they share daily lives even without passion or financial stability. One day, they learn that she’s pregnant, and start to consider how to plan their future.

A woman finds out she's pregnant and returns home when the expected father wants nothing to do with her.

At a summer-evening dance a young girl meets a man who tells her he is a doctor. They go off together, and after that she never sees him again. She learns that she is pregnant and inquires about him at various hospitals, with no success. She reads of his engagement and becomes acquainted with another girl with a situation like her own.

A carefree young man gets into a live-in relationship with his colleague, and gets her pregnant. What happens next?