Looks like the UI mod and Pregnancy info mod don't work together, at least for me they don't.
Busy, extended weekend for me, so I won't get a chance to look into it [until weekend is over]. That said, I can't think of any reason they should be incompatible.
I will mention that since the UI and the Info mods both are installed as a patch, they must be installed first. Then any mods must be turned on after. If they still don't work together tell me what you actually see (error messages or missing text in the window, etc).
Just had a moment to do some quick testing. I did a clean install of the game and applied my Navigation Information Combo patch. Then I turned on the Pregnancy mod and everything worked fine for me. So my guess is that it is an install problem.
The game's mod system is certainly a bit quirky. It creates backup versions of files and some things trigger the backup files to be copied back over the game's files. It's possible the game did this and replaced/edited a needed file.
If you are still having trouble, I'd suggest doing a clean install.
1. Turn off all mods.
2. Unzip the game into a new directory. (delete/or don't, the existing game folder, but do not extract the clean installation over the top of the existing game)
3. Drop in my patch mod (any single one of my Info Mod, Nav Mod, or Nav-Info Combo).
4. Start game and turn on Pregnancy Mod.
5. Restart game and play.