Hi, I was hoping to have a blastocyst transfer today (day 5) but have been told that my one and only surviving embryo hasn't reached Blastocyst stage yet. They were prepared to transfer today but I wanted to wait until tomorrow as I've had 3 m/c this year and would rather wait. The embryo has been a day behind in development from the beginning, so I'm not really holding out much hope, but wondered if anyone else has any experience of slow developing embryos?