I did IUI's with OI for 12 months and had no BFP's, I would take clomid get a positive LH surge and have IUI transfer 12 and 24 hr post surge. This was a 12 month every cycle and no positive it had to be of a higher stat as the concentrate and no mucus to contend with as it was catherterised up into the uterus. Suppose it depends on many different factors sperm quality and motility, immunity to cervical mucus, count all depending on the individuals results. We only had a slightly lower motility as a male issue and PCOS as the female issue. First cycle of IVF worked it was just that they didnt want to meet on the inside
As for FET's I got sore bb's even more so than what I do with Stims, the pessaries are icky but ok and the clex is stingy. As a combination they do tend to make me a little teary but not the throbbing of the FSH on the ovaries as all it does it thicken the endo till it is satisfactory for transfer.
Bec