I saw something about toxoplasmosis the other day, thought it'd be a good idea to post about it here.
Apparently kitties get it from eating raw meat. Passing it along via the litter box to a pregnant woman is rare if she takes precautions, but still a possibility.
So if you're pregnant and have a raw kitty, have someone else clean the litter box, or make sure to wear gloves and keep your distance as much as you can when you do.
If your kitty stays indoors and doesn't eat raw, then it shouldn't be a problem, but check w/your vet just in case.