High School slice of life set at special school for pregnant teens.
Episode one: the new girl MC introduces herself to the rest of the class, going through the usual motions of a first day at school like any anime.
No obviously pregnant students appear this episode (except maybe the homeroom teacher), but they give a couple hints: The genki new best friend character talks about how they should be friends because they're all 'nakama' now; the lunch scene where said friend and other characters eat so much it surprises the MC, but then she thinks "yeah, I need to eat like that, too."; subvert nods to their condition like that.
School over, the MC goes home and is greeted by parents who are very obviously worried about how everything went -more than they should be for a usual first-day-at-a-new-school. She waves off their concerns saying that it was all fine, and she wants to take a bath and rest a bit after school. They show the usual body-obscured shower scenes, and then skip to a close up of her lying on her bed and browsing on her phone while she reflects on the day's events.
She says the usual stuff about hoping everything goes well from, about wondering about the future, and finishes that she's especially worried about the future "because..."
*camera zooms out to show her lying in her underwear face up on her bed, midsection fully exposed and showing a slight, but unmistakably pronounced bulge*
Roll happy theme song credits.