I'm in the middle of my third round of IVF and when we got to transfer day our 4 embryos hadn't made it to blastocyst stage (they were not gradable, early blastocysts). They cultivated two of them to day 6 (neither progressed) and transferred two back in. I can't help but feel that our chances are over before they've really begun. It's our last chance too - in the past 3 months I've had 30 eggs collected and managed to get one blastocyst which didn't implant. Are there any success stories out there of early blastocysts being replaced on day 5 that did result in pregnancy?