She's Having a Baby (1988)

Jake (Kevin Bacon) and Kristy Briggs (Elizabeth McGovern) have made the leap from high school sweethearts to newlyweds, but married life is not what Jake expected. While he fantasizes about a dream girl and envies the lifestyle of his single best friend (Alec Baldwin), Kristy is ready to have a baby. Instead of sharing this with Jake, she opts to secretly stop taking birth control. However, Kristy comes clean after failing to become pregnant, prompting Jake to go to a fertility clinic.