The forced pregnancy mentions in the novel are worldbuilding details only at least as of the first novel (I haven't finished The Monster Baru Cormorant). From what I remember, Baru visits a place where breeding experiments are conducted and it's also talked about as a tactic used by the Masquerade to ensure suitable bloodlines in the people they conquer, but it's not front and center. None of the major or minor characters go through any pregnancies, forced or otherwise, themselves and no plot points actually hinge on it.