I myself do not have a bicornate/subseptate uterus, but my mother does. She also had an incompetant cervix and her uterus was tilted back I believe. Of 9 pregnancies she had 5 children. All 5 children were born early, usually about a month or so. I was born 14weeks early at home with only my mother and father to deliver me. We were all born naturally/vaginally. The only problem she had was due to the incompetant cervix and the stitches they put in. She has never said anything was affected by her bicornate/subseptate uterus.
I know that probably didn't help you at all.. Sorry.