My RE has started to do the endo biopsy for some of his tough cases with repeated failures. Or at least for his lining challenged patients. He just did one biopsy, which was done within a week before you got your period for the start of the cycle. I didn't find the biopsy to be that bad at all. I know that of the two of us that were on his lining challenged program, both of us got pg. Good luck with your cycle, I am hoping that this is a 3 for 3 situation.