Hi Malyna

At our clinic I had bloods taken to determine O and then the frosty was transferred 5 days later. Those were the cycles that were 'unmedicated', I also had one with meds done but it was very similar anyway.

If they thaw one embie and it doesnt survive the thaw then they start the process over with the next embie, and so on and so on until they get a viable one to transfer. So unless all 3 do not thaw then you will get a transfer that day.

Progesterone supplements are are very common and I *think* (sorry its all so long ago) I used them for all IVF/ FETs etc etc.

HTH a little, if I havent explained something or you want more detail just sing out Good luck with it!