We were unexplained and had failed IUI's etc. When they went to begin testing for the IVF cycle they discovered a polyp not very big in my ute. They said it could or couldn't be the cause of my issues. Either way I had to have it removed by surgery before beginning IVF. It was a minor out patient procedure, similar to ER. We will never know for sure if that was the cause or not, they seem to think now it was, since both embryos we transferred implanted and stuck. We had tried for 2+ years before with meds, injections, IUI's, TI everything and no luck. I think it was a saline hysterogram or something that they discovered it through. Just a thought for you to ask about if you haven't already done so. I would have never thought that before either. GL and I hope your pee sticks are wrong!