>>8409462
the few that I know are mostly WEGs.
best experience IMO is Lab Rats 2 Reformulate.
it's a kind of management/dating sim with story and randomly generated characters but in a persistent environment. the main gimmick of the game is to use serums to temporarily change the girls' statistics. you can customise the parameters of the character generator and change them after the fact with cheats.
it has customisable fertility cycles and pregnancy, which can be tampered with serum. but sadly the girls aren't really affected once the baby is born.
still overall one of the most advanced pregnancy management WEG that isn't text-only or a modded regular game. the modding community is very active because the game is very easy to expand.
BUT the downside is that actual sex scenes are basically slideshows with very low quality 3D models, even for WEG standards. that's the price to pay to get above average character customisation.
reportedly there's some guy working on brand new models but this isn't coming anytime soon.