What could make it not work?

Jill

I did clomid + follistim + ovidrel. I have PCOS and don't ovulate on my own. My husband has no issues with his sperm. What could cause a cycle to fail if we had sex when told to after the trigger? I have a son who i conceived on just clomid two years ago. Tomorrow will be day 14 for me and I'm freaking out.