I'm sorry you lost your baby loubell.
As others have said a retroverted uterus doesn't cause miscarriages.
I have one (and yeah I've had two miscarriages but entirley unrelated to that).
It is actually considered a variation of normal - about 30% of women have it so it's not uncommon or abnormal at all. All it means is that the top of your uterus points towards your back instead of your belly button.
By the time your about 12-14 weeks it will have moved to the same position as an anteverted one.
As far as scans go, I usually have to have internal scans for really early ones (say before about 10 weeks). After that you just have a regular abdominal scan because by then it will be in a better position to see.
HTH.