Hi Tutti
I also have PCOS, Unicornuate uterus, Only one tube (my other one is completely fused) and only one ovary. It may seem like there is no hope, I thought the same thing when I found out, I've had first cycle of IVF which didn't work but the consultant is hopeful that it will so I really wouldn't give up hope. I'm not sure what the consultant meant about a 'window' I'm 38 and still have two free cycles left on IVF. I'm just in process of starting process for frozen transfer.
Please don't think all is lost, the clinics these days can do miracles!!! 
xx