I'm always confused about pregnancy.
Do you guys want to see the actual stomach changes on a character or do you just want the after effects. As in, Player sleeps with girl and skip nine months with a child?
Exluding incest and/or loli loving crowd, most of the times it's the lust for pregg mothers, and you probably have at least three types of distinct audience that always want late pregnancy in their porn.
1) People that simply love chub-chubs, vore, and stomach deformation.(the minority)
2) People that love to see proof of your claim over your mates. Breeding fetish. They go after job well done satisfactorry feel more than anything.
3) Extreme vanilla cudling crowd. The romantics that want to hear their childs move in their spouses bellies.
Second and third groups overlap at least to some extent, so, just add scenes with full pregant harem of main girls at the very end of the story if you want to make them happy.