They must be able to do more than that- Are they not going to test for any problems with the uterus,sometimes the shape is abnormal, and they have to inject dye in to the uterus, and take an x-ray, think its called a hysterscopy, or HSG.
With your blood they should have done,a test for antiphospholipid syndrome, thromnophilias, MTHFR gene mutation, thyroid, and progeterone tests, and other blood clotting disorders, and something that stops your body from absorbing follic acid, (that might be the MTHFR gene)They probably have done them, but you should ask just in case they havn't.
You also get natural killer cells CD16/56 and 69 activity, which can be tested for, and I expect they have tested all of these, but I would check, as you never know if they have missed something!
I have spoke to alot of people who's tests revealed something, so if any of your blood tests do show up positive, then with the right treatment you will have a succesful pregnancy.
I hope it works out for you, and I hope you don't give up!!
I think that I'm going to have to have the ERPC I basicaly have no choice, tryed to go private, but couldn't find any where, local to me, and didn't want to travel miles. So lucky me, I've got it tmorrow.