I know I"m late to this, but for any future ladies who have a high egg count I wanted to offer some hope. These were my stats:
40 eggs, 33 mature, 25 fertilized, 20 progressed to day 2, 7 made it to day 5.
I did not get OHSS, though was monitored closely for it. I was advised to start drinking electrolyte drinks and loading up on protein foods a few days before retrieval to help reduce my chances of getting OHSS. My sister, who had around the same number of eggs did end up with OHSS, but she was never told about electrolytes or protein. She worked with a different clinic and did not like her doctor.
Anyone who is at risk for OHSS, ask about electrolytes and protein to reduce your chances. I was also put on PIO verses inserts because of how many eggs were retrieved. Eventually weaned off to inserts after my baby was solidly implanted and growing well.