BG is right - you can have PCO but not PCOS, and you can also have PCOS without PCO. It's all a bit complicated, and it's actually the hormone profile and insulin resistance that is used more in diagnosis than the appearance of the ovaries. The no response/over response situation with FSH injections is something very common with PCOS (not necessarily PCO). Confused yet?
BG is also correct in that for a very long time I wondered if I really had PCOS as my initial hormone tests weren't that bad, and I have none of the normal externally obvious symptoms of PCOS. But later hormone tests were shocking, and my insulin resistance levels are approaching the worst my FS has ever seen.

As for blast/day 2 transfer - it does cost a bit extra ($500) at my clinic. Some say that an embryo that won't make it to blast won't result in a pregnancy anyway. Some clinics stick with day 2 transfers, however. It is cheaper, and there's no absolute guarantee that if your embryo won't make it to blast in the clinic that it can't result in a viable pregnancy - there just isn't enough known about it all yet. I've read a paper that argues that the reason some clinics stick with day 2 transfers is because of inferior lab techniques and not wanting patients to blame the lab for having no embryos to transfer. So they stick them back in early, so the patient then feels that it's a problem with them rather than a problem with the lab... I thought it went a bit far, personally, but I can dig up that information once I get home.

Must run to the psychologist now... back in a couple of hours.

BW