5 Days of Stims down, how many left?

On Saturday A.M. I went in for my first BW & US in my IVF cycle. I had 12 eggs developing on one side and 9 on the other side. My E2 was 483, which means I have some time still. I think you need to be around 2,000 for the egg retrieval? I took 150 of Gonal F and 75 of menopaur for 4 days and then on Sunday the Dr had me reduce the Gonal F to 75. This morning I went back in for another US & BW and I am awaiting the results. My largest follicle was at 18 while the smallest was about 8. The rest were at varying amounts in between. I'm guessing they will have me start the ganirelix shot tonight (which prevent ovulation in the antagonist method). I will be back at the DR office tomorrow for more tests (US & BW), I will keep you posted. Have a good day!