I had heaps of follicles showing on the scans and was gutted to have only got 5 eggs. Of this 4 fertilized and 3 made it to blasto. From there I got 2 healthy pregnancies - 1 fresh and one FET 19 months later - and have one left in the freezer (which I will hopefully be using soon!). You don't need heaps to get good results!!
Jo I would also suggest getting onto your clinic. I had very mild ohss with my DS and it was really nasty! Made the first trimester (yes, the full 3 months) a real nightmare. And that was only a very mild case.