Tilted uterus changed direction - why?

Aislin
I've just had a miscarriage, and at my confirmation scan the ultrasound technician made a note that I have a backwards tilted uterus. But I had a scan two years ago to try get to the bottom of a medical problem (endometriosis) and at the time they noted that I had a forward tilted uterus.
Did it change direction because I got pregnant? Because I thought the uterus moved forward during pregnancy - not back? Is there another reason the tilt would change?