Glenpip this is my 4th attempt and it's the longest I have been pregnant since my ds was born in 2012. I didn't think I was going to be able to get this far because I hadn't the previous 3. My fertility clinic were great I rang them nearly each week about my results and what not but also to push for appointments faster. I thought I must I got of got on their nerves but on my appointment after my scan they were so nice and pleased for me.
To be honest the tests were just blood test and a scan. I take a high dosage of folic acid an aspirin and a pregnecare tablet each day. I think it helped me to know things and read up on things I read about on the miscarriage board,I was given advice about what to ask and it helped me understand some of the things they talked about. (I am pretty sure you have looked at all that too I'm just sharing my experience).
It's unfair we have to go through these things. Push and pester for your appointment, I got my appointment 4 weeks faster because I rang to see if there were an cancelations. Also it really helped that I knew my cycle really well, it also helped my blood tests.
Goodluck I will wait to read your developments (don't go name changeing now).