The ultra sound lady said yesterday that I have one too. I asked her what that meant and she said it is where the uterus tilts posteriorly (towards the back of the body) rather than anteriorly (towards the front). Both she and the radiologist said that the uterus can change position at anytime, and that they have both seen one re-align during an ultrasound. They said that as your pregnancy progresses, the uterus will naturally realign, and that it has no effect on conception nor does it cause a miscarriage. But, having said that, I had a miscarriage last year, and now am ?5weeks pregnant, though there is a high probability that I have miscarried this one too, so who knows??