Hi Sooty just wanted to say that, I really don't think you should be too stressed that you didn't have blastocysts or they were very early blastocysts to transfer. We had 6 on day 5 but the three blastocyst were abnormals and we were left with 2 morula sand a compacting morula. The hope is a compacting morula on day 5 is just a bit slower and for me I did get pregnant from a morula (the stage before a blastocyst). From memory after doing some research there is also some studies on the sex of the blastocyst and rate of development with female ones taking longer to reach blastocyst but these studies relate to ICSI where the individual sperm is injected into the egg. Anyway I definitely got pregnant from a slow dividing embryo and there's lots of success stories out there. I lost mine because of immune issues but please be positive and hopefully in 2 weeks you will have some good news.