I'm so sorry you got cancelled - it's so frustrating to go through all that for nothing!
Trust me, you do NOT want to get OHSS. I don't know what my levels where before trigger, but they were below the cutoff for cancelling and I still got hyperstimulated and ended up in hospital for a few days.
It's really hard to find the right balance between enough and not too much stimulation - unfortunately that means sometimes we end up with a couple of practice runs.
Hopefully next time they can get it right.
Good luck.