arg! this internet connection is sooooo sloooooow! Anyway, just thought I'd share - I asked a nurse friend of my parents' this afternoon, and she is quite certain that yeast doesn't grow into the uterus. I'm sure she doesn't know *everything*, but she does work primarily in well-woman care, so she knows quite a bit. I am somewhat reassured. Also, unless the yeast is irritating your cervix quite a bit, it shouldn't affect a pregnancy. How many weeks were you when you miscarried? I don't have the patience for this connection, nor access to my books here, but you should look up when the cervix becomes "competent", or closes (this would be about when they put the stitch into an "incompetent" cevix during pregnancy), because I would think that cervical irritation before that point wouldn't have too great of an effect. Just a hypothesis.
Also, do you know how to find your cervix? Because if you do, you should be able to feel carefully along it and you would feel any lumps, bumps, sore spots, roughness, etc, etc. If it is nice and smooth, you could feel pretty secure in the knowledge that it doesn't have any sores on it.
Miscarriages and fertility can certainly do a number on a person's confidence in their bodies, as well as cause a woman to question every. single. thing.