I transferred two and froze two. The two I transferred were not tested. I wanted to test the two that were frozen since I want a sibling for my daughter but I'd rather she be older. Thus, I wanted to know if they were chromosomally normal.
Again, my clinic had no problem testing two and both survived thaw and biopsy . . . . I really wouldn't worry as long as the lab is good and vitrification is used.
I would really get a second opinion from another RE. I just find it odd that you keep having these miscarriages. Many people have one, but three is something else. I read a blog by a woman who had six and now is finally
about 20 weeks pregnant. She had to do some heavy duty immune treatment stuff (and she did test all embryos she transferred after a few miscarriages). She went to CCRM. You may find it interesting: http://lifeandloveinthepetridish.blogspot.com/