Already at the beginning of the film
Nola is unhappy - she is not from a loving family, she has career and financial problems, her parents-in-law look down on her, she has been dumped by Tom. She then has an affair with the married Chris, and her life gets even worse as she expects him to leave his wife for her, but he doesn't, and she inadvertently gets pregnant by him (at least that's what she says). By the end of the film, she is despairing of her situation.
Chris and Nola have sex for the first time in a wheat field in the pouring rain, which is a fairly popular
cliché with romcoms.