Hi oneday..... i got 15 eggs, 10 fertilised, 2 made it to blasts and i had one put back in and one frozen. The fresh one didnt work, but the subsequent transfer of the frozen one did!! So.....whilst it can often seem like you are "wasting" eggs, it only takes one to work!! I used to stress about so many not making it, but that is out of your hands, and the whole thing is stressful enough, so try not to worry!! Goodluck!!