I was due my fourth embryo transfer last week, but unfortunately the embryo didn't survive the thawing 
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It's our first cycle, and the first three frozen embryos were all transferred successfully, but unfortunately none resulted in pregnancy. Due to OH's age, we're keen to get a move on with things so asked the consultant if it was worth us going for another cycle and mentioned the possibility of donor sperm. She said that as we get another cycle on the NHS we should just do the same again, and that it was just bad luck that none of our embryos had taken.
However I'm not sure that it is just bad luck - OH had to have surgical sperm retrieval and they couldn't find any when trying to do a needle extraction so had to remove tissue. They then managed to get a sample but said none of the sperm were motile, a few were twitching and the rest were completely immotile. Despite that, 11 eggs did fertilise and we had 8 embryos that survived PGD testing and made it to 5 days. Unfortunately 4 had the gene we were trying to avoid, so we were left with 4, all graded at 5BB (which I think is the minimum quality they will freeze embryos at). A previous consultant told us that the embryos were ok but not particularly good quality.
If it is just bad luck then obviously we would like to proceed with another cycle; however if there is another avenue we should be pursuing we want to do it now rather than waiting (it took over three years from referral to completing the first cycle, and we just don't have that much time any more if it's very unlikely to work).
Our clinic aren't very informative, so was just wondering if anyone had had more information from their clinic about likely success rates with lower quality embryos?
Thank you 