I bet he's thinking the larger one could be a cyst. The first time I took Clomid, I ended up with a cyst from hyperstimulation. What happened for me was that after pregnancy didn't occur that cycle, my OB had me take a cycle of bcp to shrink the cyst before she let me try Clomid round 2. I really don't know if that's standard practice or not. I believe a good follicle with an egg would grow up until about 20mm, then it should burst and release the egg. A cyst would be a follicle that contains fluid, but not a good egg. The smaller on you have could still grow enough to be a good one. This is the way I understand it, but I'm rusty since it's been almost 3 yrs now since we were trying, so hopefully I'm somewhat accurate. Good luck!!!