Missy - Sushee said it - yes my boys!

My understanding is blasts have a higher success based on my opinion from hanging around IVF forums (not just BB) but even if you transferred those particular embryos at day 2 -3 they in all likelihodd would implant just as well too IYKWIM.

They say just the strongest / best embryos make it to blast. But not all clinics grow embryos to blast especially if you only have a few fertilised eggs due to the high attrition rate and they would rather transfer an embryo than none. There are so many factors about why a bubba sticks or doesn't.

If you ask a few of ladies with successful IVF bubs - you might an even mix of day 2-3 embryos and blastocysts.

Goodluck with your little miracle Missy.