The pregnant in editor, but not on spawn in, is a new occurrence.
In fact, that's the first time I've seen it force the pregnant belly on creating a new character.
My real character is supposed to be pregnant, but on loading she's visibly pregnant, but the icons at top left are gone.
From the Main Menu, clicking the save for my main loads my main in the editor, then clicking new game loads the default model, but makes it appear pregnant. This without modifying any sliders for pregnancy, c-fill, or general shape(s).