Hi Sarah, according to google the fischer cone is an updated version of lletz. Its more accurate apparently. So nothing to worry about. When I took my daughter for her lletz we were told it would have no affect on getting pregnant but it could in rare cases cause premature labour. They are only talking about 3 weeks prem so no worries there. My daughter like you has PCOS and they knew that so it would be same advice for you. Try not to worry and i hope all goes well for you.xxx