I've had 3 IVF's and only 16 eggs for all three. First time, 6 eggs, 4 fertilized, 3 transferred on day three (two were good quality). The one not transferred did not survive past day 4 so was not frozen.
Second time, 5 eggs, 4 fertilized, 4 transferred (3 were good quality).
Third time, 5 retreived, 4 fertilized, 3 survived and were transferred on day 3(two were good quality). I am finally pregnant from this last IVF...one baby - 6 weeks along.
Work with your Dr on deciding how many to transfer back, ours was great with provding us the pros and cons based on our number of cycles we had been through and the number and quality of eggs. You also may have some to freeze and save for later which is great because you wouldn't have to have the retreival procedure again.
Best of luck!!!