Only that I had a freind (she moved away) who had a double uterus and she had two sons, both of whom had occupied the same uterus at different times. She had no trouble getting pregnant.
I have no data on this and what the usual fertility is for these women, but she did--her sons would be about 18 and 25, now.
Seems to me if there's a uterus(or more) and ovaries and fallopian tubes that are open, and normal hormonal levels, it shouldn't be a problem. Have you checked with an Obstetrician?