I haven't had a chance to read all the responses posted to your question here, but I thought I would mention to you and everyone else who is concerned about recurrent pregnancy loss and MTHFR. I have a group here on MH that I specifically created for MTHFR. I too have the same variant (C677T) and also suffered three miscarriages this year. I am now treated properly for the MTHFR (something that is very hard to do I learned) and am now currently and successfully 16 weeks pregnant.
There is a ton of information that I have posted regarding this genetic variant simply because it is not well known - or rather is known but has much debate surrounding it's treatment. Please take the time to look at the group forum I put together on this very topic - MTHFR (and recurrent pregnancy loss) and hopefully you can take some of the information that I have listed and put together back to your doctor or find a specialist who deals with MTHFR as I have had to do. Also you will find many others in this group who you can ask or chat with who have gone through or are currently going through what you and I have.
Please also do not hesitate to message me directly. I have much information that I can share with you or anyone else who is just learning about this Variant. If you can get tested for it and also on a treatment regimen, it can change your life with respect to trying to conceive and staying pregnant.
In addition to anything I have mentioned, please keep in mind, that while I or others may have extensive knowledge in many areas, you should always seek professional medical advice from your own physician, as it pertains to medical conditions or concerns.
Good luck, and if you have any other questions that I can help you with, please feel free to message me directly.
MedHelp Genetics Community Leader;
Children - Special Needs Community Leader;
Down syndrome Community Leader & Ds Group Forum Founder/Moderator;
MTHFR Group Forum Founder/Moderator;
Pregnancy: June 2011 Community Leader