dani The stress of TTC is bad enough without having the added stress of not very helpful medical support. I would be going out of my mind if I were in your shoes. I am so sorry for how you must be feeling. I had a look for a bit of info on PCOS for you (I know nothing about it). My suggestion, based on my experience with GPs, is to go in armed with info - print out important info and highlight the salient points. This article here, for example, spells out that PCOS is not a cut and dried diagnosis. And what that really means is someone needs to put some effort into helping you properly before it can be totally ruled out.
Here's a UK site with the quote you need: "Therefore, it is possible to have polycystic ovaries without the typical symptoms that are in the syndrome. It is also possible to have PCOS without multiple cysts in the ovary."
I don't think you should leave until your GP has referred you to a specialist who will spend time working out what's happening. My GP wouldn't even tell me if spotting at the end of a cycle was normal or not because, she said 'she was a generalist and not able to give such specific information' . My DH's GP refused to give him any insights at all into his SA results for the same reason. So there is no way your GP should be the person trying to sort you out... they not fully trained in this.
And... it would be unacceptable for your GP to leave you with one person thinking its PCOS and the other thinking not, but I'm afraid that they will if you don't force them to move it forwards.
I am not good at pushing in this way at all (usually end up getting teary), but I now take my DH in with me and we gang up on the GP together. Can you get your DH to come with you to nail this down properly and sure you leave with proper help lined up?
I've also started putting my thoughts in writing to my GP because I think these letters must go into my file somewhere so if they don't respond there's a proper record of my concerns that I can later point to - I do seem to get a better response when I've done that.
I hope I don't sound stroppy in this, but I might do, because when it comes to dealing with my GP I am 80% of the time very irritated and I am feeling really on your behalf. Really hope you get some help. x