I've only just read your thread and am wondering if you have had luck with your GP giving you a referral for a FS yet?
My DH and I were TTC for 12 months before my GP gave me a referral. He kept doing the same sort of thing, taking bloods and ultra sounds and the only thing he ever told me was that I was too stressed and once I relax and stop stressing so much it will happen. Well after I hit the 12 month mark I had had enough so he finally gave me a referral and as soon as I got booked in and saw the doctor they started doing some REAL investigation. I'll be beginning my first course of Clomid to help me ovulate this month. Other than that they haven't found any problems but my experience has told me that GPs are never any good at helping when it comes to problems TTC.
I wish you all the luck in the world and I hope that you can find out what is delaying a pg asap!
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