I found a website that talked about the likelihood of being diagnosed with an impending miscarriage, and then going on to have a viable pregnancy.

At Misdiagnosed Miscarriage one of the referenced pages talks about blighted ovum - an empty fetal sac - being diagnosed in women with retroverted uteri (tiled backward) only to find that the baby had been well hid due to the position/shape of the uterus when using transvaginal ultrasounds.

So out of curiosity, I did a search, and have found multitudes of accounts of this happening... So I did a literature search. Sure enough, there is nothing in the literature about this.

Do I see a research project in my future? Maybe... I gotta get through a dissertation first.