Yep I have one, was discovered during a scan at 8 weeks with my dd1. I was having the scan because of heavy bleeding and they did discover that I had been carrying twins but had lost one.
The doctor said I would have really struggled to carry twins to a safe number of weeks with the shape of my womb anyway.
Anyway since then it hasn't really caused me any problems. Dd1 was in a transverse position from quite early on and unable to turn right way up because of lack of space, so I had a c-section at 38 weeks, dd was perfectly fine and healthy and is now nearly 9yrs old. I had no signs of early labour at all, although I had been warned alot about this.
I had been told that it can be hard to concieve with a bicornuate uterus but I certainly didn't find that.
With dd2 I had no problems throughout the pregnancy until 34 weeks when I went into labour. Dd2 was delivered by c-section and spent 2 weeks in scbu but was fine. They weren't sure wether the early labour was caused by the shape of the womb or an infection and I never found out for sure.
I then had Ds and had no problems connected to the shape of womb at all, except he was breech too, again cos of lack of space.
Basically I have had very few problems because of it. Obviously I can't say wether you will go into early labour or not, but please don't let people scare you by them going on and on about it. I was petrified when pregnant with Dd1 but never even had a twinge before I had the section.
Hope everything goes ok for you and your baby.