Do you have any pregnancy mods for teens etc?
My Hacks/Mods are:
Johna's sliders + Delphy's breast sliders
RB skill tweaks + cheaper maid
Treag - Put Away All Books, Treasure Box, and Book of Talent
That's it and none of them mess with pregnancy. I googled this problem and none of the suggested solutions worked for me.
Try removing the sliders....my game said some mods were out of date yesterday so i eventually got the game to start when i removerd the sliders.
Though I think some people have the latest patch and they still work, which confused me.
But try it, it worked for me, even though it's a pain.