Ineedmiracle,
thru scans in Stage 2 (stimulation phase - puregon or GnF), you can only see the number of follicles and sizes. based on this together with the BT result (in NUH), the gynea will decide is there is a need to increase the dosage. However, we will not know how many eggs there are sonce not all follicles contain eggs.
when the scan shows at least 3 nos. of 18mm follicles (a guide only), you'll be scheduled to ER.
you will know how many follicles were retrieved, how many with eggs, and then they will try to fertilse eggs with sperms. finally, all the numbers before this does not matter. what matters is how many fertilised embbies u finally have. next the gynea will look at is the grade of embbies, judging by the cell dividing by the days, and whether there are fragmentation etc.
and ET will depend on your case, usu D2 transfer for KKH and D3 transfer for NUH, and blastocyst transfer (D5) if you have many fertilised embies.
i do not actually know too much details but the brief picture is something like that lar... hope it helps in your mental prep.
and other sisters, anything to add on, or to correct me if i'm wrong?
Ineedmiracle, most impt thing is try to be positive and stress-free durning your cycle. jia you!