I've heard people talk about a mod that causes miscarriage, under certain conditions (or adjustable?) but can't find.

I think it's on this list of Chris Hatch's mods complied by Smorbie-it's called the 'alternate pregnancy controller".
http://modthesims.info/showthread.php?t=603534

Found the actual file from the SFS link:
CJH_PregControl+Miscarraige.package

There are 3 of them in there, and Smorbie stated that there are text files to go with them. One of them should be the one you want.

Inteen has it too.

@FranH None of the PregControl files work for me from that link by Smorbie I try all three all I get when I open the files is strange language that can not be understood. No package file at all.
Do you have another direct link where I can get the direct package ? thanks

The files look fine to me, and most of the files posted in those folders look to be package files. Make sure you save them instead of opening them. The "Readme" and ".odt" files are text files. I've also checked a couple of the files in SimPE, and they seem to be what they're supposed to be.

I did get some weird text when hovering the mouse over one of the files, but clicking a second time let me download the file.

Never mind, I have Insimenator I notice it had the feature to get pregnant or lose it. Also the Sim Manipulator seem to have this feature, But I personally still like the Insimentor.
It is said to be unsupported ( Insimenator ) only because the creator is not around anymore,. but it's still good,that is always said about a creator who is no longer in the Sims community. lol

I'm seeing 5 package files with that exact name (no text files) but they are not the same size (35.8 KB & 42). So I still don't know which one to just slip into my Downloads.