Welcome pass, lbann and kirin, though sorry that you find yourselves needing to be here
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pass, if you have been referred to an rmc consultant then that's good news, although you might have a bit of a wait before an appointment. Many of the rmc prefer to wait 6 weeks before taking the bloods for the clotting tests, as your pg bloods will be different from non pg ones. When you get your appointment they will probably take about 8 vials of blood for all the clotting tests. They will hopefully offer you a uterine scan to check for any shape abnormalities, adhesions and things like polyps/fibroids. You may also be offered karyotyping on you and your partner, to look for genetic causes, although a recent change in nhs policy means that this is no longer routine unless karyotyping on the embryo (if you had it) comes back showing a possible cause. Also this is quite rare (less than 5%), and there is no specific treatment, so it's just keep going until you find a good egg/sperm combo.
In 50% of cases no cause is found and they put it down to 'bad luck'. This term makes me very 
You're best to write a list of questions before you go so you don't forget anything. Make sure you ask about what support will be offered next pg (extra scans, appointment with the consultant etc), and how you access that support. I didn't ask this and when i rang the secretary with spotting in the next pg it took the consultant 4 weeks to get back to me, by which time I'd miscarried again. Also ask about what testing they are doing and what treatment they might offer. If you are thinking of seeking other testing/treatment, such as coventry, it would be worth finding out how open they are to prescribing that drug protocol. (My consultant refused to prescribe the steroids, so i had to go cap in hand to my gp.)
I was able to get some extra testing at my gp (full blood count, blood sugar, hormones, thyroid function, coeliac screen), which my consultant refused to do. All came back normal.
After this disappointing 'normal' diagnosis, and my 4th mc, i went to Coventry implantation clinic, and tested high for uNK cells (mentioned in post above). I would highly recommend them as a next step for anyone who had normal nhs results.
I had 5 mc in all, but am now 28+4 pg following the treatment (steroids, heparin, progesterone) from Coventry. I don't believe I'd be here without them.
lbann, persistence is important, and with my last two mc they may have been just 'bad luck', but i just didn't buy it for all of them. For you, after 5 early and one late mc, i definitely think it's worth you looking at some other testing. Coventry is a good place to start as it's cheap (£360) compared to some of the private options. There is still hope and lots of good news stories from this thread, although since the hacking, most have moved over to our facebook group. If any of you want to join that, pm me your name and a description of your pic and I'll try and add you.