I've been having a problem with pregnant sims throwing a pregnancy controller issue when they are about to enter into the second trimester. I can't reset or cancel the error. The only way to get out of it is to hit delete and then exit without saving.
I've pulled all hacks from the game and started adding them back in to attempt to figure out what is causing the problem. And have determined that it's one of the hacks from here as these are the only hacks I haven't added back into the game yet and the problem is gone.
I'm just not sure exactly which hack from the MATY folder is causing the problem, to my knowledge I haven't downloaded anything from here that would target a pregnant sim.
Here's the error log. Hopefully that will point you in the right direction.