not pregnant after embryo transfer

Yes, our clinic did the PGD and one embryo was transferred but I don't know the grade of the embryo. Out of six embryo only three embryo make it and out of that three only one of the embryo is balanced. But just can't understand why I am not pregnant. It failed three times already. First time did not make to retrieval because egg was not big enough so we stopped that cycle. Second time had egg retrieval but did not make it transfer because there was nothing to transfer. Third time I make it through transfer with one embryo after PGD was preformed. But five days after embryo transfer i have my period. It was transferred on day five of blastocyst embryo.

We will be meeting with the doctor on January 6, 2009 at 10:00 with the new plan. I hope all is well and that this new plan will help us.