I'm another with a retroverted uterus. It's as common as 1 in 5 woman. I found out at a scan at 8 weeks with my first pregnancy (which sadly ended with my angel). When I fell pregnant with my son my Ob mentioned it again. He told me that early on it can make things a little harder to see on scans, but at the first early scan he does an internal scan anyway. He also said the only complication that might occur is that as you approach 12-14 weeks and the uterus starts to grow out of the pelvis, very rarely the uterus can get 'stuck' on the sacrum (which is called an incarcerated uterus) and it can start to compress the bladder and urethra and prevent you from urinating. It's quite painful and often requires a catheter to be placed. The treatment is basically rocking on your hands and knees to 'free' the uterus and it's usually very effective very quickly. It's a pretty rare thing to occur though.