At what stage of embryo development is it better to do the transfer, 3 or 5 days?
We transfer most embryos on day 5 in the blastocyst stage, but it is always up to the embryologist to decide when it is best to perform the transfer. It is a complex decision and depends on many variables.
What options are available for any remaining embryos?
Embryos which are not transferred may either be frozen for future use or donated to another couple.
Are there limits on the number of embryos which can be transferred?
The maximum of number of fresh embryos to be transferred is 2, at one given time. This is to avoid increased chances of multiple pregnancies.