In my experience most pregnant teen novels start before the pregnancy. In With the Fire on High, high school junior Emoni's two-year-old daughter is a fact. Emoni and Babygirl (government name Emma) live with Emoni's abuela. Emoni's mother died in childbirth, and her father drops in time to time from Puerto Rico. Emoni and Buela are doing pretty well, all things considering. Buela's disability checks aren't plentiful. Emoni supplements them working at Burger Joint (Burger Jawn, let's be honest, as the novel takes place in Philadelphia)--a challenge because Emoni is a passionate and gifted cook.
She always knows which spice to add to make a food come into its own, like sprinkling cayenne on the chocolate pudding her culinary arts class was charged with making. Despite how delicious the cayenne inflected pudding is, the teacher/chef tells Emoni a cook has to make exactly what the chef says. That doesn't go well at first, but Emoni desperately wants to go on the culinary arts trip to Spain, so she makes her peace with it, and leans in to fundraising.
This being YA, there's also a love story, and this being good YA, there's also a friend story. I love that this is a multidimensional story about a teen mom that doesn't ignore parenting, but also acknowledges the teen mom as a person with a lot going on that isn't solely about her parenting status.