Hi Janine, I am Fran and I am a fertility nurse – I am part of the IVF Network team offering support. Routinely, we always used to transfer day 3 embryos before day 5 blastocyst came about. Often if you have smaller egg and embryo numbers, its recommended to put back days 3 embryos as the best environment for them is the womb. You should test 14 days post transfer – hope that helps.
Fran