@Scirocco Interesting to hear you experienced the same. At consultation few weeks ago they said had I been AMH above 20 on my original AMH test I'd have been on the antagonist protocol (instead of the agonist long protocol we did last time). I have told them in my 20s I got an ultrasound done and was told my ovaries had a polycystic appearance, but that my GP said there was no point pursuing a PCOS diagnosis if I wasn't trying to conceive (which I realise now was stupid of GP).
When clinic kept saying to retest AMH it kept sounding like they thought my AMH had tanked and that's why I was having such a poor response. What I think now though is they are maybe mistaking cysts for follicules, as last time they could see 7 big "follicules" but my estrogen levels only indicated 2 or max 3 mature eggs (and we only got 2 mature eggs).
What they agreed at consultation was (subject to AMH being above 8.3) we could move to antagonist protocol, with high dosage FSH (so 300iu instead of 200) and letting my follicules grow bigger before trigger, and delaying egg collection by an extra hour after trigger, all in the hope that would give us a better outcome. But will need to see if they keep that plan or not.
I've asked GCRM to get a nurse to call me to discuss plan as my day 1 today and I'm desperate for then to let us get going on the next cycle