I have seen a few women with double uterus's. I have only being a midwife for 2years and have seen 4 different people with double uterus's and two cervix. One actually had a double uterus (didn't know it) and they couldn't work out why she wasn't dilating in labour what so ever. She had a c/s and turns out she had no cervix in the side the baby was so there was no way it was getting out (don't know how it got in the dr reckons it was medically impossible except look at how small sperm are as if they couldnt squeeze through membrans anyway sneaky little things) well she had to have a hysterectomy as there was no way for the blood for the op to come out after she was closed back up. She still has her other uterus (that her 1st and 2nd child were conceived in) in which she were able to birth vaginally. Another lady knew she had two uterus from a pap smear. She also had two vaginas and had 5 vaginal deliverys then with her last she went 10days over due and was induced and it was unsuccessful and she went for a C/S. Her first 5 children had being in the other side and she had no problems with delivery vaginally until no 6 who was in the opposite side to her siblings. Its pretty interesting.