thanks so much for the information, i feel a lot better already knowing some of that stuff.
At this stage the main decision is whether to do iui or ivf, like you we have done a LOT of transfers and treatment and i have had enough of it all. i think id rather just do ivf and get a stock of frozen embryos and use them (and hopefully fingers crossed have some left over for future siblings - thinking long term). Im a bit worried that my pcos and history of hyperstimulation will mean that i will have too many eggs in an iui cycle and it will have to be cancelled. one thing i am not willing to do is to go through any more cancelled cycles!

Will let you know how it goes tomorrow!